1个回答
2013-11-11
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42页 (1)1.62 1.62
3.6 450
(2)a
(b+c)
a+((b+c))=b+(a+c)
a.(bc)=b.(ac)
(ac)+(bc)
c(a-b)
(3) > >
=
=
<
=
2 × 对对对对
3)8 10
0.0081 20
0.24
0.86
2 24
7又五分之二
20分之3
9分之1
(2)13.2-3.7-6.3
10.26-(3.78+4.26)
=13.2-(3.7+6.3)
=10.26-4.26-37.8
=3.2
=2.22
2.4÷0.25
(十二分之七+八分之三)×24
=24÷四分之一
=十二分之七×24+八分之三×24
=9.6
=23
101×7.8
六分之五+5.2+六分之一+5.2
=7.8×100+7.8×1
=六分之五+六分之一+5.2+5.2
=787.8
=11.4
五分之一×24+176×五分之一
1.9×32×125×0.25
=五分之一×(24+176)
=1.9×125×0.25×32
=40
=1900
8.6×三分之二+8.6÷3
2.74÷十四分之五+7.26×2.8
=8.6
=28
9999×7778+3333×6666
=9×1111×7778+3×1111×6×1111
=3×3×1111×7778+3×1111×6×1111
=3×1111×(23334+6666)
=3×1111×30000
=99990000
或
9999×7778+3333×6666
=9999×7778+3333×9×2222
=9999×7778+9999×2222
=9999×(7778+2222)
=9999×10000
=99990000
5.6×69.32+138.64×0.05+693.2×0.43
=5.6×69.32+69.32×2×0.05+69.32×4.3
=69.32×(5.6+0.1+4.3)
=69.32×10
=693.2
43页 (1)152.6(2)120
2)3
2 1
2 2
3)(1)(51+三十五分之三十四)÷17
19.9+19.9×99
=3又三十五分之二
=(99+1)×19.9
=1990
999×1999
[1-(二分之一-四分之一)]×三分之一
=(999+1)×(1999+1)
=二分之一
=1000×2000-(1999×1+1999×1)
=3000000-1997001
=1997001
20000÷12.5÷25÷0.8÷4
=20000÷(12.5×0.8×25×4)
=2000÷(10×100)
=2000÷1000
=20
38×四分之一+17×0.25+45×25%
=四分之一×(38+17+45)
=四分之一×1000
=25
2.78×7.8+2.78×3.2-2.78
=2.78×(7.8+3.2)-2.78
=2.78×10-2.87
=27.8
4)176÷(1+七分之一)
=154(万人)
5)24-24×三分之一-24×二分之一
=24-20
=4(米)
小=2 花=5 狗=1
3.6 450
(2)a
(b+c)
a+((b+c))=b+(a+c)
a.(bc)=b.(ac)
(ac)+(bc)
c(a-b)
(3) > >
=
=
<
=
2 × 对对对对
3)8 10
0.0081 20
0.24
0.86
2 24
7又五分之二
20分之3
9分之1
(2)13.2-3.7-6.3
10.26-(3.78+4.26)
=13.2-(3.7+6.3)
=10.26-4.26-37.8
=3.2
=2.22
2.4÷0.25
(十二分之七+八分之三)×24
=24÷四分之一
=十二分之七×24+八分之三×24
=9.6
=23
101×7.8
六分之五+5.2+六分之一+5.2
=7.8×100+7.8×1
=六分之五+六分之一+5.2+5.2
=787.8
=11.4
五分之一×24+176×五分之一
1.9×32×125×0.25
=五分之一×(24+176)
=1.9×125×0.25×32
=40
=1900
8.6×三分之二+8.6÷3
2.74÷十四分之五+7.26×2.8
=8.6
=28
9999×7778+3333×6666
=9×1111×7778+3×1111×6×1111
=3×3×1111×7778+3×1111×6×1111
=3×1111×(23334+6666)
=3×1111×30000
=99990000
或
9999×7778+3333×6666
=9999×7778+3333×9×2222
=9999×7778+9999×2222
=9999×(7778+2222)
=9999×10000
=99990000
5.6×69.32+138.64×0.05+693.2×0.43
=5.6×69.32+69.32×2×0.05+69.32×4.3
=69.32×(5.6+0.1+4.3)
=69.32×10
=693.2
43页 (1)152.6(2)120
2)3
2 1
2 2
3)(1)(51+三十五分之三十四)÷17
19.9+19.9×99
=3又三十五分之二
=(99+1)×19.9
=1990
999×1999
[1-(二分之一-四分之一)]×三分之一
=(999+1)×(1999+1)
=二分之一
=1000×2000-(1999×1+1999×1)
=3000000-1997001
=1997001
20000÷12.5÷25÷0.8÷4
=20000÷(12.5×0.8×25×4)
=2000÷(10×100)
=2000÷1000
=20
38×四分之一+17×0.25+45×25%
=四分之一×(38+17+45)
=四分之一×1000
=25
2.78×7.8+2.78×3.2-2.78
=2.78×(7.8+3.2)-2.78
=2.78×10-2.87
=27.8
4)176÷(1+七分之一)
=154(万人)
5)24-24×三分之一-24×二分之一
=24-20
=4(米)
小=2 花=5 狗=1
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