100道小数的简便计算及答案
展开全部
这是我上学期出给学生做的,加减乘除的都有,你看有没有合你心意的。
公式1:a-b-c
=
a-(b+c)
10-0.432
-2.568
9.3-5.26-2.74
13.4-(3.4+5.2)
14.9-(5.2+4.9)
18.32-5.47-4.32
17.29-5.28-6.29
公式2:(axb)xc=ax(bxc)
25×6.8×0.04
0.25×32×0.125
6.4×1.25×12.5
公式3:c×(a+b)=ca+cb
0.45×201
0.58×10.1
50.2×99
4.7×9.9
3.28x5.7+6.72x5.7
2.1×99+2.1
1.7×9.9+0.17
23×0.1+2.3×9.9
0.18+4.26-0.18+4.26
0.58x1.3÷0.58x1.3
7.3÷4+2.7x0.25
3.75x0.5-2.75÷2
5.26x0.125+2.74÷8
公式4:a÷b÷c=a÷(b×c)
6.3÷1.8
4.2÷3.5
9.5÷(1.9
×
8)
12.8÷(0.4×1.6)
930÷0.6÷5
63.4÷2.5÷0.4
(7.7+1.54)÷0.7
(11.7+9.9)÷0.9
简便计算:
100-0.99
10.99+9.87
4.089÷0.047
0.24×390
6.9+4.8+3.1
0.456+6.22+3.78
15.89+(6.75-5.89)
4.02+5.4+0.98
5.17-1.8-3.2
13.75-(3.75+6.48)
3.68+7.56-2.68
7.85+2.34-0.85+4.66
35.6-1.8-15.6-7.2
3.82+2.9+0.18+9.1
9.6+4.8-3.6
7.14-0.53-2.47
5.27+2.86-0.66+1.63
13.35-4.68+2.65
73.8-1.64-13.8-5.36
47.8-7.45+8.8
0.398+0.36+3.64
15.75+3.59-0.59+14.25
66.86-8.66-1.34
0.25×16.2×4
(1.25-0.125)x8
3.6x102
3.72x3.5+6.28x3.5
36.8-3.9-6.1
4.8×7.8+78×0.52
32+4.9-0.9
4.8×100.1
56.5×9.9+56.5
7.09x10.8-0.8x7.09
25.48-(9.4-0.52)
4.2÷3.5
320÷1.25÷8
18.76×9.9+18.76
3.52÷2.5÷0.4
3.9-4.1+6.1-5.9
5.6÷3.5
9.6÷0.8÷0.4
4.2×99+4.2
17.8÷(1.78×4)
0.49÷1.4
1.25×2.5×32
3.65×10.1
15.2÷0.25÷4
0.89×100.1
146.5-(23+46.5)
3.83×4.56+3.83×5.44
4.36×12.5×8
9.7×99+9.7
27.5×3.7-7.5×3.7
8.54÷2.5÷0.4
0.65×101
3.2×0.25×12.5
7.2×0.2+2.4×1.4
8.9×1.01
7.74×(2.8-1.3)+1.5×2.26
3.9×2.7+3.9×7.3
18-1.8÷0.125÷0.8
12.7×9.9+1.27
21×(9.3-3.7)-5.6
15.02-6.8-1.02
5.4×11-5.4
2.3×16+2.3×23+2.3
9.43-(6.28-1.57)
3.65×4.7-36.5×0.37
46×57+23×86
13.7×0.25-3.7÷4
2.22×9.9+6.66×6.7
101×0.87-0.91×87
10.7×16.1-15.1×10.7
0.79×199
4.8+8.63+5.2+0.37
5.93+0.19+2.81
1.76+0.195+3.24
2.35+1.713+0.287+7.65
1.57+0.245+7.43
6.02+3.6+1.98
0.134+2.66+0.866
1.27+3.9+0.73+16.1
7.5+4.9-6.5
3.07-0.38-1.62
1.29+3.7+2.71+6.3
8-2.45-1.55
3.25+1.79-0.59+1.75
23.4-0.8-13.4-7.2
0.32×403
3.2+0.36+4.8+1.64
1.23+3.4-0.23+6.6
0.25×36
12.7-(3.7+0.84)
36.54-1.76-4.54
0.25×0.73×4
7.6×0.8+0.2×7.6
0.85×199
0.25×8.5×4
1.28×8.6+0.72×8.6
12.5×0.96×0.8
10.4-9.6×0.35
0.8×(4.3×1.25)
3.12+3.12×99
28.6×101-28.6
0.86×15.7-0.86×14.7
2.4×102
2.31×1.2×0.5
14-7.32-2.68
2.64+8.67+7.36+11.33
70÷28
(2.5-0.25)×0.4
9.16×1.5-0.5×9.16
3.6-3.6×0.5
63.4÷2.5÷0.4
4.9÷1.4
3.9÷(1.3×5)
(7.7+1.54)÷0.7
2.5×2.4
2.7÷45
15÷(0.15×0.4)
0.35×1.25×2×0.8
32.4×0.9+0.1×32.4
15÷0.25
公式1:a-b-c
=
a-(b+c)
10-0.432
-2.568
9.3-5.26-2.74
13.4-(3.4+5.2)
14.9-(5.2+4.9)
18.32-5.47-4.32
17.29-5.28-6.29
公式2:(axb)xc=ax(bxc)
25×6.8×0.04
0.25×32×0.125
6.4×1.25×12.5
公式3:c×(a+b)=ca+cb
0.45×201
0.58×10.1
50.2×99
4.7×9.9
3.28x5.7+6.72x5.7
2.1×99+2.1
1.7×9.9+0.17
23×0.1+2.3×9.9
0.18+4.26-0.18+4.26
0.58x1.3÷0.58x1.3
7.3÷4+2.7x0.25
3.75x0.5-2.75÷2
5.26x0.125+2.74÷8
公式4:a÷b÷c=a÷(b×c)
6.3÷1.8
4.2÷3.5
9.5÷(1.9
×
8)
12.8÷(0.4×1.6)
930÷0.6÷5
63.4÷2.5÷0.4
(7.7+1.54)÷0.7
(11.7+9.9)÷0.9
简便计算:
100-0.99
10.99+9.87
4.089÷0.047
0.24×390
6.9+4.8+3.1
0.456+6.22+3.78
15.89+(6.75-5.89)
4.02+5.4+0.98
5.17-1.8-3.2
13.75-(3.75+6.48)
3.68+7.56-2.68
7.85+2.34-0.85+4.66
35.6-1.8-15.6-7.2
3.82+2.9+0.18+9.1
9.6+4.8-3.6
7.14-0.53-2.47
5.27+2.86-0.66+1.63
13.35-4.68+2.65
73.8-1.64-13.8-5.36
47.8-7.45+8.8
0.398+0.36+3.64
15.75+3.59-0.59+14.25
66.86-8.66-1.34
0.25×16.2×4
(1.25-0.125)x8
3.6x102
3.72x3.5+6.28x3.5
36.8-3.9-6.1
4.8×7.8+78×0.52
32+4.9-0.9
4.8×100.1
56.5×9.9+56.5
7.09x10.8-0.8x7.09
25.48-(9.4-0.52)
4.2÷3.5
320÷1.25÷8
18.76×9.9+18.76
3.52÷2.5÷0.4
3.9-4.1+6.1-5.9
5.6÷3.5
9.6÷0.8÷0.4
4.2×99+4.2
17.8÷(1.78×4)
0.49÷1.4
1.25×2.5×32
3.65×10.1
15.2÷0.25÷4
0.89×100.1
146.5-(23+46.5)
3.83×4.56+3.83×5.44
4.36×12.5×8
9.7×99+9.7
27.5×3.7-7.5×3.7
8.54÷2.5÷0.4
0.65×101
3.2×0.25×12.5
7.2×0.2+2.4×1.4
8.9×1.01
7.74×(2.8-1.3)+1.5×2.26
3.9×2.7+3.9×7.3
18-1.8÷0.125÷0.8
12.7×9.9+1.27
21×(9.3-3.7)-5.6
15.02-6.8-1.02
5.4×11-5.4
2.3×16+2.3×23+2.3
9.43-(6.28-1.57)
3.65×4.7-36.5×0.37
46×57+23×86
13.7×0.25-3.7÷4
2.22×9.9+6.66×6.7
101×0.87-0.91×87
10.7×16.1-15.1×10.7
0.79×199
4.8+8.63+5.2+0.37
5.93+0.19+2.81
1.76+0.195+3.24
2.35+1.713+0.287+7.65
1.57+0.245+7.43
6.02+3.6+1.98
0.134+2.66+0.866
1.27+3.9+0.73+16.1
7.5+4.9-6.5
3.07-0.38-1.62
1.29+3.7+2.71+6.3
8-2.45-1.55
3.25+1.79-0.59+1.75
23.4-0.8-13.4-7.2
0.32×403
3.2+0.36+4.8+1.64
1.23+3.4-0.23+6.6
0.25×36
12.7-(3.7+0.84)
36.54-1.76-4.54
0.25×0.73×4
7.6×0.8+0.2×7.6
0.85×199
0.25×8.5×4
1.28×8.6+0.72×8.6
12.5×0.96×0.8
10.4-9.6×0.35
0.8×(4.3×1.25)
3.12+3.12×99
28.6×101-28.6
0.86×15.7-0.86×14.7
2.4×102
2.31×1.2×0.5
14-7.32-2.68
2.64+8.67+7.36+11.33
70÷28
(2.5-0.25)×0.4
9.16×1.5-0.5×9.16
3.6-3.6×0.5
63.4÷2.5÷0.4
4.9÷1.4
3.9÷(1.3×5)
(7.7+1.54)÷0.7
2.5×2.4
2.7÷45
15÷(0.15×0.4)
0.35×1.25×2×0.8
32.4×0.9+0.1×32.4
15÷0.25
展开全部
这是我上学期出给学生做的,加减乘除的都有,你看有没有合你心意的。
公式1:a-b-c
=
a-(b+c)
10-0.432
-2.568
9.3-5.26-2.74
13.4-(3.4+5.2)
14.9-(5.2+4.9)
18.32-5.47-4.32
17.29-5.28-6.29
公式2:(axb)xc=ax(bxc)
25×6.8×0.04
0.25×32×0.125
6.4×1.25×12.5
公式3:c×(a+b)=ca+cb
0.45×201
0.58×10.1
50.2×99
4.7×9.9
3.28x5.7+6.72x5.7
2.1×99+2.1
1.7×9.9+0.17
23×0.1+2.3×9.9
0.18+4.26-0.18+4.26
0.58x1.3÷0.58x1.3
7.3÷4+2.7x0.25
3.75x0.5-2.75÷2
5.26x0.125+2.74÷8
公式4:a÷b÷c=a÷(b×c)
6.3÷1.8
4.2÷3.5
9.5÷(1.9
×
8)
12.8÷(0.4×1.6)
930÷0.6÷5
63.4÷2.5÷0.4
(7.7+1.54)÷0.7
(11.7+9.9)÷0.9
简便计算:
100-0.99
10.99+9.87
4.089÷0.047
0.24×390
6.9+4.8+3.1
0.456+6.22+3.78
15.89+(6.75-5.89)
4.02+5.4+0.98
5.17-1.8-3.2
13.75-(3.75+6.48)
3.68+7.56-2.68
7.85+2.34-0.85+4.66
35.6-1.8-15.6-7.2
3.82+2.9+0.18+9.1
9.6+4.8-3.6
7.14-0.53-2.47
5.27+2.86-0.66+1.63
13.35-4.68+2.65
73.8-1.64-13.8-5.36
47.8-7.45+8.8
0.398+0.36+3.64
15.75+3.59-0.59+14.25
66.86-8.66-1.34
0.25×16.2×4
(1.25-0.125)x8
3.6x102
3.72x3.5+6.28x3.5
36.8-3.9-6.1
4.8×7.8+78×0.52
32+4.9-0.9
4.8×100.1
56.5×9.9+56.5
7.09x10.8-0.8x7.09
25.48-(9.4-0.52)
4.2÷3.5
320÷1.25÷8
18.76×9.9+18.76
3.52÷2.5÷0.4
3.9-4.1+6.1-5.9
5.6÷3.5
9.6÷0.8÷0.4
4.2×99+4.2
17.8÷(1.78×4)
0.49÷1.4
1.25×2.5×32
3.65×10.1
15.2÷0.25÷4
0.89×100.1
146.5-(23+46.5)
3.83×4.56+3.83×5.44
4.36×12.5×8
9.7×99+9.7
27.5×3.7-7.5×3.7
8.54÷2.5÷0.4
0.65×101
3.2×0.25×12.5
7.2×0.2+2.4×1.4
8.9×1.01
7.74×(2.8-1.3)+1.5×2.26
3.9×2.7+3.9×7.3
18-1.8÷0.125÷0.8
12.7×9.9+1.27
21×(9.3-3.7)-5.6
15.02-6.8-1.02
5.4×11-5.4
2.3×16+2.3×23+2.3
9.43-(6.28-1.57)
3.65×4.7-36.5×0.37
46×57+23×86
13.7×0.25-3.7÷4
2.22×9.9+6.66×6.7
101×0.87-0.91×87
10.7×16.1-15.1×10.7
0.79×199
4.8+8.63+5.2+0.37
5.93+0.19+2.81
1.76+0.195+3.24
2.35+1.713+0.287+7.65
1.57+0.245+7.43
6.02+3.6+1.98
0.134+2.66+0.866
1.27+3.9+0.73+16.1
7.5+4.9-6.5
3.07-0.38-1.62
1.29+3.7+2.71+6.3
8-2.45-1.55
3.25+1.79-0.59+1.75
23.4-0.8-13.4-7.2
0.32×403
3.2+0.36+4.8+1.64
1.23+3.4-0.23+6.6
0.25×36
12.7-(3.7+0.84)
36.54-1.76-4.54
0.25×0.73×4
7.6×0.8+0.2×7.6
0.85×199
0.25×8.5×4
1.28×8.6+0.72×8.6
12.5×0.96×0.8
10.4-9.6×0.35
0.8×(4.3×1.25)
3.12+3.12×99
28.6×101-28.6
0.86×15.7-0.86×14.7
2.4×102
2.31×1.2×0.5
14-7.32-2.68
2.64+8.67+7.36+11.33
70÷28
(2.5-0.25)×0.4
9.16×1.5-0.5×9.16
3.6-3.6×0.5
63.4÷2.5÷0.4
4.9÷1.4
3.9÷(1.3×5)
(7.7+1.54)÷0.7
2.5×2.4
2.7÷45
15÷(0.15×0.4)
0.35×1.25×2×0.8
32.4×0.9+0.1×32.4
15÷0.25
公式1:a-b-c
=
a-(b+c)
10-0.432
-2.568
9.3-5.26-2.74
13.4-(3.4+5.2)
14.9-(5.2+4.9)
18.32-5.47-4.32
17.29-5.28-6.29
公式2:(axb)xc=ax(bxc)
25×6.8×0.04
0.25×32×0.125
6.4×1.25×12.5
公式3:c×(a+b)=ca+cb
0.45×201
0.58×10.1
50.2×99
4.7×9.9
3.28x5.7+6.72x5.7
2.1×99+2.1
1.7×9.9+0.17
23×0.1+2.3×9.9
0.18+4.26-0.18+4.26
0.58x1.3÷0.58x1.3
7.3÷4+2.7x0.25
3.75x0.5-2.75÷2
5.26x0.125+2.74÷8
公式4:a÷b÷c=a÷(b×c)
6.3÷1.8
4.2÷3.5
9.5÷(1.9
×
8)
12.8÷(0.4×1.6)
930÷0.6÷5
63.4÷2.5÷0.4
(7.7+1.54)÷0.7
(11.7+9.9)÷0.9
简便计算:
100-0.99
10.99+9.87
4.089÷0.047
0.24×390
6.9+4.8+3.1
0.456+6.22+3.78
15.89+(6.75-5.89)
4.02+5.4+0.98
5.17-1.8-3.2
13.75-(3.75+6.48)
3.68+7.56-2.68
7.85+2.34-0.85+4.66
35.6-1.8-15.6-7.2
3.82+2.9+0.18+9.1
9.6+4.8-3.6
7.14-0.53-2.47
5.27+2.86-0.66+1.63
13.35-4.68+2.65
73.8-1.64-13.8-5.36
47.8-7.45+8.8
0.398+0.36+3.64
15.75+3.59-0.59+14.25
66.86-8.66-1.34
0.25×16.2×4
(1.25-0.125)x8
3.6x102
3.72x3.5+6.28x3.5
36.8-3.9-6.1
4.8×7.8+78×0.52
32+4.9-0.9
4.8×100.1
56.5×9.9+56.5
7.09x10.8-0.8x7.09
25.48-(9.4-0.52)
4.2÷3.5
320÷1.25÷8
18.76×9.9+18.76
3.52÷2.5÷0.4
3.9-4.1+6.1-5.9
5.6÷3.5
9.6÷0.8÷0.4
4.2×99+4.2
17.8÷(1.78×4)
0.49÷1.4
1.25×2.5×32
3.65×10.1
15.2÷0.25÷4
0.89×100.1
146.5-(23+46.5)
3.83×4.56+3.83×5.44
4.36×12.5×8
9.7×99+9.7
27.5×3.7-7.5×3.7
8.54÷2.5÷0.4
0.65×101
3.2×0.25×12.5
7.2×0.2+2.4×1.4
8.9×1.01
7.74×(2.8-1.3)+1.5×2.26
3.9×2.7+3.9×7.3
18-1.8÷0.125÷0.8
12.7×9.9+1.27
21×(9.3-3.7)-5.6
15.02-6.8-1.02
5.4×11-5.4
2.3×16+2.3×23+2.3
9.43-(6.28-1.57)
3.65×4.7-36.5×0.37
46×57+23×86
13.7×0.25-3.7÷4
2.22×9.9+6.66×6.7
101×0.87-0.91×87
10.7×16.1-15.1×10.7
0.79×199
4.8+8.63+5.2+0.37
5.93+0.19+2.81
1.76+0.195+3.24
2.35+1.713+0.287+7.65
1.57+0.245+7.43
6.02+3.6+1.98
0.134+2.66+0.866
1.27+3.9+0.73+16.1
7.5+4.9-6.5
3.07-0.38-1.62
1.29+3.7+2.71+6.3
8-2.45-1.55
3.25+1.79-0.59+1.75
23.4-0.8-13.4-7.2
0.32×403
3.2+0.36+4.8+1.64
1.23+3.4-0.23+6.6
0.25×36
12.7-(3.7+0.84)
36.54-1.76-4.54
0.25×0.73×4
7.6×0.8+0.2×7.6
0.85×199
0.25×8.5×4
1.28×8.6+0.72×8.6
12.5×0.96×0.8
10.4-9.6×0.35
0.8×(4.3×1.25)
3.12+3.12×99
28.6×101-28.6
0.86×15.7-0.86×14.7
2.4×102
2.31×1.2×0.5
14-7.32-2.68
2.64+8.67+7.36+11.33
70÷28
(2.5-0.25)×0.4
9.16×1.5-0.5×9.16
3.6-3.6×0.5
63.4÷2.5÷0.4
4.9÷1.4
3.9÷(1.3×5)
(7.7+1.54)÷0.7
2.5×2.4
2.7÷45
15÷(0.15×0.4)
0.35×1.25×2×0.8
32.4×0.9+0.1×32.4
15÷0.25
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展开全部
3.56+4.54+6.44+5.46
5.03-0.25-1.75
4.86+5.24-1.86
8.13+(1.87-0.5)
23.7-1.6-3.7-8.4
87.4-(21.25+17.4)
-8.75
14.6-9.9
1.9+1.99+1.999
19.43-(6.72+1.43)
2.69-1.35+3.31-2.65
17.28-3.86-6.14+2.72
5.25+3.76-2.76+4.75
4.5+5.5-4.5+5.5
21.53-(13.64-8.47)
28.49-1.1-2.47-6.43
7.34+2.5+2.66-1.5
3.25+1.79-0.59+1.75
3.79-1.225-(3.775-6.21)
27.38-5.34+2.62-4.66
二、课后练习
4.12+8.59+5.88+1.41
12.87-1.34-2.66
21.53+4.87-2.53
15.21+(4.79-2.8)
12.19-2.6-2.19-3.4
109.72-(5.62+9.72)
21.3-19.9
39.6-(18.31+9.6)
-1.69
14.25-2.45+5.75-3.55
24.51-3.14-6.86+4.49
41.25+5.87-3.87+4.65
11.5+8.5-11.5+8.5
8.13-(12.25-11.87)
34.34-2.1-2.35-5.55
81.67+4.17+4.33-2.17
1.35+12.87-1.37+8.65
15.51-3.334-(2.666-4.49)
21.62-4.35+8.38-5.65
小数乘除法简便计算
一、课堂练习
0.125×3.69×8
(2.5-0.25)
×4
8.59×101
0.36×15.7-0.36×13.7
5.64×1.28+8.72×5.64
0.63×199
60÷48
7.73×0.5+2.27÷2
4.37+99×4.37
10.1×38.67-3.867
9.9÷5.5
8.63×25-0.063×250
9.3×10.1
3.99÷0.125÷8
0.99×0.81+0.11×9×0.19
(5.23+5.23+5.23+5.23)
×25
0.25×1.25×0.67×32
2.49×3.8+0.249×62
33.41÷4-3.41×0.25
54.8-0.3×0.3-3.91
(6.4+48)
÷0.8
15×9.7
2.5×(4+8)
×12.5
二、课后练习
0.25×8×2.12
(12.5-1.25)×8
5.7×18.34-57×0.834
3.87×4.12+5.88×3.87
8.8÷5.5
3.25×199
5.64+99×5.64
20.1×35.22-3.522
5.2×20.1
3.7×1.63-0.37×15.3
0.88×0.78+0.11×0.22×0.8
2.5×(4.21+4.21+8.42)
1.25×1.86×32×0.25
4.34×0.25+0.25×5.56+0.025
(7.2+54)
÷0.9
2.73×0.125+7.27÷8
56.34÷2-6.34×0.5
11.43÷0.8÷12.5
12×19.8
21.56-0.4×0.4-3.84
80÷32
7.56×101
1.25×2.5×(8+4)
5.03-0.25-1.75
4.86+5.24-1.86
8.13+(1.87-0.5)
23.7-1.6-3.7-8.4
87.4-(21.25+17.4)
-8.75
14.6-9.9
1.9+1.99+1.999
19.43-(6.72+1.43)
2.69-1.35+3.31-2.65
17.28-3.86-6.14+2.72
5.25+3.76-2.76+4.75
4.5+5.5-4.5+5.5
21.53-(13.64-8.47)
28.49-1.1-2.47-6.43
7.34+2.5+2.66-1.5
3.25+1.79-0.59+1.75
3.79-1.225-(3.775-6.21)
27.38-5.34+2.62-4.66
二、课后练习
4.12+8.59+5.88+1.41
12.87-1.34-2.66
21.53+4.87-2.53
15.21+(4.79-2.8)
12.19-2.6-2.19-3.4
109.72-(5.62+9.72)
21.3-19.9
39.6-(18.31+9.6)
-1.69
14.25-2.45+5.75-3.55
24.51-3.14-6.86+4.49
41.25+5.87-3.87+4.65
11.5+8.5-11.5+8.5
8.13-(12.25-11.87)
34.34-2.1-2.35-5.55
81.67+4.17+4.33-2.17
1.35+12.87-1.37+8.65
15.51-3.334-(2.666-4.49)
21.62-4.35+8.38-5.65
小数乘除法简便计算
一、课堂练习
0.125×3.69×8
(2.5-0.25)
×4
8.59×101
0.36×15.7-0.36×13.7
5.64×1.28+8.72×5.64
0.63×199
60÷48
7.73×0.5+2.27÷2
4.37+99×4.37
10.1×38.67-3.867
9.9÷5.5
8.63×25-0.063×250
9.3×10.1
3.99÷0.125÷8
0.99×0.81+0.11×9×0.19
(5.23+5.23+5.23+5.23)
×25
0.25×1.25×0.67×32
2.49×3.8+0.249×62
33.41÷4-3.41×0.25
54.8-0.3×0.3-3.91
(6.4+48)
÷0.8
15×9.7
2.5×(4+8)
×12.5
二、课后练习
0.25×8×2.12
(12.5-1.25)×8
5.7×18.34-57×0.834
3.87×4.12+5.88×3.87
8.8÷5.5
3.25×199
5.64+99×5.64
20.1×35.22-3.522
5.2×20.1
3.7×1.63-0.37×15.3
0.88×0.78+0.11×0.22×0.8
2.5×(4.21+4.21+8.42)
1.25×1.86×32×0.25
4.34×0.25+0.25×5.56+0.025
(7.2+54)
÷0.9
2.73×0.125+7.27÷8
56.34÷2-6.34×0.5
11.43÷0.8÷12.5
12×19.8
21.56-0.4×0.4-3.84
80÷32
7.56×101
1.25×2.5×(8+4)
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