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4个回答
展开全部
(1)2.5*32*0.125
=(2.5*4)*(8*0.125)
=10*1
=10
(2)3.5-7+6.5
=3.5+6.5-7
=3
(3)1.2×2.5+0.8×2.5
=2.5(1.2+0.8)
=25
(4)8.9×1.25-0.9×1.25
=1.25(8.9-0.9)
=10
(5)12.5×7.4×0.8
=12.5×0.8×7.4
=74
(6)6.5×9.5+6.5×0.5
=6.5×(9.5+0.5)
=6.5×10
=65
(7)0.35×1.6+0.35×3.4
=0.35*(1.6+3.4)
=0.35*5
=1.75
(8)6.72-3.28-1.72
=6.75-(3.28+1.72)
=6.75-5
=1.75
(9)0.45+6.37+4.55
=0.45+4.55+6.37
=5+6.37
=11.37
(10)28×12.5-12.5×20
=(28-20)*12.5
=8*12.5
=100
(11)23.65-(3.07+3.65)
=23.65-3.65-3.07
=20-3.07
=16.93
(12)(4+0.4×0.25)8×7×1.25
=(4+1)*7*10
=5*7*10
=350
(13)1.65×99+1.65
=1.65*(99+1)
=1.65*100
=165
(14)27.85-(7.85+3.4)
=27.85-7.85+3.4
=20+3.4
=23.4
(15)48×1.25+50×1.25×0.2×8
7.8×9.9+0.78
=7.8*(9.9+0.1)
=7.8*10
=78
(16)4.8×46+4.8×54
=(46+54)*4.8
=100*4.8
=480
(17)673-327-173
=673-(327+173)
=673-500
=173
(18)4.44*2.5
=1.11*(4*2.5)
=1.11*10
=11.1
(19)3.5÷1.4
=(3.5÷0.7)÷(1.4÷0.7)
=5÷2
=2.5
(20)1+2+3+4+5......+99+100
=(1+99)+(2+98)+(3+97)+......+(49+51)+50
=(100÷2-1)*100+50
=4900+50
=4950⑴运用加法交换律进行简便计算。
0.88+5.6+0.12 1.78+3.5+0.22 5.6+2.08+14.4
=0.88+0.12+5.6 =1.78+0.22+3.5 =5.6+14.4+2.08
=1+5.6 =2+3.5 =20+2.08
=6.6 =5.5 =22.08
⑵运用加法结合律进行简便计算
2.3+(0.56+4.7) 28.6+0.54+0.46+1.4 5.82+4.56+5.44
=(2.3+4.7)+0.56 =(28.6+1.4)+(0.54+0.46) =5.82+(4.56+5.44)
=7+0.56 =30+1 =5.82+10
=7.56 =31 =15.82
⑶、运用乘法交换律进行简便计算。
25×0.37×0.4 7.5×0.39×4 6.5×1.1×4 1.25×3.9×0.8
=25×0.4×0.37 =7.5×4×0.39 =6.5×4×1.1 =1.25×0.8×3.9
=10×0.37 =30×0.39 =26×1.1 =1×3.9
=3.7 =11.7 =28.6 =3.9
⑷、运用乘法结合律进行简便计算。
1.9×7.5×8 6.2×0.8×2.5 4.3×1.5×6 4.1×3.5×2
=1.9×(7.5×8) =6.2×(0.8×2.5) =4.3×(1.5×6) =4.1×(3.5×2)
=1.9×60 =6.2×2 =4.3×9 =4.1×7
=114 =12.4 =38.7 =28.7
⑸、运用乘法分配律的加法进行简算。
13.6×4.6+4.6×6.4 0.72×23+77×0.72 2.6×32+32×2.4
=(13.6+6.4)×4.6 =(23+77)×0.72 =(2.6+2.4) ×32
=20×6.4 =100×0.72 =5×32
=128 =72 =160
⑹、运用乘法分配律的减法进行简算。
12×5.9-5.9×2 4.6×2.5-2.5×0.6 101×9.7-9.7
=(12-2) ×5.9 =(4.6-0.6)×2.5 =(101-1)×9.7
=(12-2) ×5.9 =(4.6-0.6)×2.5 =(101-1)×9.7
=10×5.9 =4×2.5 =100×9.7
=59 =10 =970
⑺、运用减法的运算规律进行简便计算。
1.8-0.45-0.55 54.4-4.6-5.4 35.6-0.13-0.47
=1.8-(0.45+0.55) =54.4-(4.6+5.4) =35.6-(0.13+0.47)
=1.8-1 =54.4-10 =35.6-0.6
=0.8 =44.4 =35
⑻、运用除法的运算规律进行简便计算。
4.5÷4÷7.5 14.8÷1.25÷8 18.5÷4÷1.25 5.4÷4÷0.45
=4.5÷(4×7.5) =14.8÷(1.25×8) =18.5÷(4×1.25) =5.4÷(4×0.45)
=4.5÷30 =14.8÷10 =18.5÷5 =5.4÷0.18
=0.15 =1.48 =3.7 =30
⑼综合运用各种运算定律进行简算。
2.54+2.46+0.44+0.54 10.7×0.4-6.7×0.4 0.5×3.2×1.25
=(2.54+2.46)+(0.44+0.54) =(10.7-6.7)×0.4 =(0.5×4)×(0.8×1.25)
=5+1 =4×0.4 =2×1
=6 =1.6 =2
89.7+5.8-9.7+4.2 99×0.38+0.38 360÷(18×0.4)
=(89.7-9.7)+(5.8+4.2) =(99+1) ×0.38 =360÷18÷0.4
=80+10 =100×0.38 =20÷0. 4
=90 =38 =50
4.8×12.5 2.5×1.6×12.5 3.2×102
=0.6×(8×12.5) =(2.5×0.2)×(8×12.5) =3.2×(100+2)
=0.6×100 =0.5×100 =3.2×100+3.2×2
=60 =50 =320+6.4
=326.4
=(2.5*4)*(8*0.125)
=10*1
=10
(2)3.5-7+6.5
=3.5+6.5-7
=3
(3)1.2×2.5+0.8×2.5
=2.5(1.2+0.8)
=25
(4)8.9×1.25-0.9×1.25
=1.25(8.9-0.9)
=10
(5)12.5×7.4×0.8
=12.5×0.8×7.4
=74
(6)6.5×9.5+6.5×0.5
=6.5×(9.5+0.5)
=6.5×10
=65
(7)0.35×1.6+0.35×3.4
=0.35*(1.6+3.4)
=0.35*5
=1.75
(8)6.72-3.28-1.72
=6.75-(3.28+1.72)
=6.75-5
=1.75
(9)0.45+6.37+4.55
=0.45+4.55+6.37
=5+6.37
=11.37
(10)28×12.5-12.5×20
=(28-20)*12.5
=8*12.5
=100
(11)23.65-(3.07+3.65)
=23.65-3.65-3.07
=20-3.07
=16.93
(12)(4+0.4×0.25)8×7×1.25
=(4+1)*7*10
=5*7*10
=350
(13)1.65×99+1.65
=1.65*(99+1)
=1.65*100
=165
(14)27.85-(7.85+3.4)
=27.85-7.85+3.4
=20+3.4
=23.4
(15)48×1.25+50×1.25×0.2×8
7.8×9.9+0.78
=7.8*(9.9+0.1)
=7.8*10
=78
(16)4.8×46+4.8×54
=(46+54)*4.8
=100*4.8
=480
(17)673-327-173
=673-(327+173)
=673-500
=173
(18)4.44*2.5
=1.11*(4*2.5)
=1.11*10
=11.1
(19)3.5÷1.4
=(3.5÷0.7)÷(1.4÷0.7)
=5÷2
=2.5
(20)1+2+3+4+5......+99+100
=(1+99)+(2+98)+(3+97)+......+(49+51)+50
=(100÷2-1)*100+50
=4900+50
=4950⑴运用加法交换律进行简便计算。
0.88+5.6+0.12 1.78+3.5+0.22 5.6+2.08+14.4
=0.88+0.12+5.6 =1.78+0.22+3.5 =5.6+14.4+2.08
=1+5.6 =2+3.5 =20+2.08
=6.6 =5.5 =22.08
⑵运用加法结合律进行简便计算
2.3+(0.56+4.7) 28.6+0.54+0.46+1.4 5.82+4.56+5.44
=(2.3+4.7)+0.56 =(28.6+1.4)+(0.54+0.46) =5.82+(4.56+5.44)
=7+0.56 =30+1 =5.82+10
=7.56 =31 =15.82
⑶、运用乘法交换律进行简便计算。
25×0.37×0.4 7.5×0.39×4 6.5×1.1×4 1.25×3.9×0.8
=25×0.4×0.37 =7.5×4×0.39 =6.5×4×1.1 =1.25×0.8×3.9
=10×0.37 =30×0.39 =26×1.1 =1×3.9
=3.7 =11.7 =28.6 =3.9
⑷、运用乘法结合律进行简便计算。
1.9×7.5×8 6.2×0.8×2.5 4.3×1.5×6 4.1×3.5×2
=1.9×(7.5×8) =6.2×(0.8×2.5) =4.3×(1.5×6) =4.1×(3.5×2)
=1.9×60 =6.2×2 =4.3×9 =4.1×7
=114 =12.4 =38.7 =28.7
⑸、运用乘法分配律的加法进行简算。
13.6×4.6+4.6×6.4 0.72×23+77×0.72 2.6×32+32×2.4
=(13.6+6.4)×4.6 =(23+77)×0.72 =(2.6+2.4) ×32
=20×6.4 =100×0.72 =5×32
=128 =72 =160
⑹、运用乘法分配律的减法进行简算。
12×5.9-5.9×2 4.6×2.5-2.5×0.6 101×9.7-9.7
=(12-2) ×5.9 =(4.6-0.6)×2.5 =(101-1)×9.7
=(12-2) ×5.9 =(4.6-0.6)×2.5 =(101-1)×9.7
=10×5.9 =4×2.5 =100×9.7
=59 =10 =970
⑺、运用减法的运算规律进行简便计算。
1.8-0.45-0.55 54.4-4.6-5.4 35.6-0.13-0.47
=1.8-(0.45+0.55) =54.4-(4.6+5.4) =35.6-(0.13+0.47)
=1.8-1 =54.4-10 =35.6-0.6
=0.8 =44.4 =35
⑻、运用除法的运算规律进行简便计算。
4.5÷4÷7.5 14.8÷1.25÷8 18.5÷4÷1.25 5.4÷4÷0.45
=4.5÷(4×7.5) =14.8÷(1.25×8) =18.5÷(4×1.25) =5.4÷(4×0.45)
=4.5÷30 =14.8÷10 =18.5÷5 =5.4÷0.18
=0.15 =1.48 =3.7 =30
⑼综合运用各种运算定律进行简算。
2.54+2.46+0.44+0.54 10.7×0.4-6.7×0.4 0.5×3.2×1.25
=(2.54+2.46)+(0.44+0.54) =(10.7-6.7)×0.4 =(0.5×4)×(0.8×1.25)
=5+1 =4×0.4 =2×1
=6 =1.6 =2
89.7+5.8-9.7+4.2 99×0.38+0.38 360÷(18×0.4)
=(89.7-9.7)+(5.8+4.2) =(99+1) ×0.38 =360÷18÷0.4
=80+10 =100×0.38 =20÷0. 4
=90 =38 =50
4.8×12.5 2.5×1.6×12.5 3.2×102
=0.6×(8×12.5) =(2.5×0.2)×(8×12.5) =3.2×(100+2)
=0.6×100 =0.5×100 =3.2×100+3.2×2
=60 =50 =320+6.4
=326.4
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展开全部
(1)2.5*32*0.125
=(2.5*4)*(8*0.125)
=10*1
=10
(2)3.5-7+6.5
=3.5+6.5-7
=3
(3)1.2×2.5+0.8×2.5
=2.5(1.2+0.8)
=25
(4)8.9×1.25-0.9×1.25
=1.25(8.9-0.9)
=10
(5)12.5×7.4×0.8
=12.5×0.8×7.4
=74
(6)6.5×9.5+6.5×0.5
=6.5×(9.5+0.5)
=6.5×10
=65
(7)0.35×1.6+0.35×3.4
=0.35*(1.6+3.4)
=0.35*5
=1.75
(8)6.72-3.28-1.72
=6.75-(3.28+1.72)
=6.75-5
=1.75
(9)0.45+6.37+4.55
=0.45+4.55+6.37
=5+6.37
=11.37
(10)28×12.5-12.5×20
=(28-20)*12.5
=8*12.5
=100
(11)23.65-(3.07+3.65)
=23.65-3.65-3.07
=20-3.07
=16.93
(12)(4+0.4×0.25)8×7×1.25
=(4+1)*7*10
=5*7*10
=350
(13)1.65×99+1.65
=1.65*(99+1)
=1.65*100
=165
(14)27.85-(7.85+3.4)
=27.85-7.85+3.4
=20+3.4
=23.4
(15)48×1.25+50×1.25×0.2×8
7.8×9.9+0.78
=7.8*(9.9+0.1)
=7.8*10
=78
(16)4.8×46+4.8×54
=(46+54)*4.8
=100*4.8
=480
(17)673-327-173
=673-(327+173)
=673-500
=173
(18)4.44*2.5
=1.11*(4*2.5)
=1.11*10
=11.1
(19)3.5÷1.4
=(3.5÷0.7)÷(1.4÷0.7)
=5÷2
=2.5
(20)1+2+3+4+5......+99+100
=(1+99)+(2+98)+(3+97)+......+(49+51)+50
=(100÷2-1)*100+50
=4900+50
=4950
⑴运用加法交换律进行简便计算。
0.88+5.6+0.12=0.88+0.12+5.6=1+5.6=6.6
1.78+3.5+0.22=1.78+0.22+3.5=2+3.5=5.5
5.6+2.08+14.4 =5.6+14.4+2.08=20+2.08=22.08
⑵运用加法结合律进行简便计算
2.3+(0.56+4.7) =(2.3+4.7)+0.56 =7+0.56 =7.56
28.6+0.54+0.46+1.4 =(28.6+1.4)+(0.54+0.46) =30+1 =31
5.82+4.56+5.44 =5.82+(4.56+5.44) =5.82+10=15.82
⑶、运用乘法交换律进行简便计算。
25×0.37×0.4=25×0.4×0.37=10×0.37=3.7
7.5×0.39×4 =7.5×4×0.39 =30×0.39 =11.7
6.5×1.1×4 =6.5×4×1.1 =26×1.1 =2.86
1.25×3.9×0.8=1.25×0.8×3.9=1×3.9 =3.9
⑷、运用乘法结合律进行简便计算。
1.9×7.5×8=1.9×(7.5×8) =1.9×60=114
6.2×0.8×2.5=6.2×(0.8×2.5) =6.2×2 =12.4
4.3×1.5×6=4.3×(1.5×6) =4.3×9 =38.7
4.1×3.5×2 =4.1×(3.5×2)=4.1×7=28.7
⑸、运用乘法分配律的加法进行简算。
13.6×4.6+4.6×6.4=(13.6+6.4)×4.6=20×4.6 =92
0.72×23+77×0.72 =(23+77)×0.72=100×0.72 =72
2.6×32+32×2.4 =(2.6+2.4) ×32 =5×32 =160
⑹、运用乘法分配律的减法进行简算。
12×5.9-5.9×2=(12-2) ×5.9 =10×5.9=59
4.6×2.5-2.5×0.6 =(4.6-0.6)×2.5=4×2.5 =10
101×9.7-9.7 =(101-1)×9.7=100×9.7=970
⑺、运用减法的运算规律进行简便计算。
1.8-0.45-0.55=1.8-(0.45+0.55) =1.8-1 =0.8
54.4-4.6-5.4=54.4-(4.6+5.4) =54.4-10=44.4
35.6-0.13-0.47=35.6-(0.13+0.47)=35.6-0.6=35
⑻、运用除法的运算规律进行简便计算。
4.5÷4÷7.5=4.5÷(4×7.5)=4.5÷30=0.15
14.8÷1.25÷8=14.8÷(1.25×8)=14.8÷10 =1.48
18.5÷4÷1.25=18.5÷(4×1.25)=18.5÷5 =3.7
5 .4÷4÷0.45 =5.4÷(4×0.45) =5.4÷0.18=30
⑼综合运用各种运算定律进行简算。
2.54+2.46+0.44+0.54 =(2.54+2.46)+(0.44+0.54)=5+1 =6
10.7×0.4-6.7×0.4=(10.7-6.7)×0.4=4×0.4 =1.6
0.5×3.2×1.25 =(0.5×4)×(0.8×1.25) =2×1 =2
=(2.5*4)*(8*0.125)
=10*1
=10
(2)3.5-7+6.5
=3.5+6.5-7
=3
(3)1.2×2.5+0.8×2.5
=2.5(1.2+0.8)
=25
(4)8.9×1.25-0.9×1.25
=1.25(8.9-0.9)
=10
(5)12.5×7.4×0.8
=12.5×0.8×7.4
=74
(6)6.5×9.5+6.5×0.5
=6.5×(9.5+0.5)
=6.5×10
=65
(7)0.35×1.6+0.35×3.4
=0.35*(1.6+3.4)
=0.35*5
=1.75
(8)6.72-3.28-1.72
=6.75-(3.28+1.72)
=6.75-5
=1.75
(9)0.45+6.37+4.55
=0.45+4.55+6.37
=5+6.37
=11.37
(10)28×12.5-12.5×20
=(28-20)*12.5
=8*12.5
=100
(11)23.65-(3.07+3.65)
=23.65-3.65-3.07
=20-3.07
=16.93
(12)(4+0.4×0.25)8×7×1.25
=(4+1)*7*10
=5*7*10
=350
(13)1.65×99+1.65
=1.65*(99+1)
=1.65*100
=165
(14)27.85-(7.85+3.4)
=27.85-7.85+3.4
=20+3.4
=23.4
(15)48×1.25+50×1.25×0.2×8
7.8×9.9+0.78
=7.8*(9.9+0.1)
=7.8*10
=78
(16)4.8×46+4.8×54
=(46+54)*4.8
=100*4.8
=480
(17)673-327-173
=673-(327+173)
=673-500
=173
(18)4.44*2.5
=1.11*(4*2.5)
=1.11*10
=11.1
(19)3.5÷1.4
=(3.5÷0.7)÷(1.4÷0.7)
=5÷2
=2.5
(20)1+2+3+4+5......+99+100
=(1+99)+(2+98)+(3+97)+......+(49+51)+50
=(100÷2-1)*100+50
=4900+50
=4950
⑴运用加法交换律进行简便计算。
0.88+5.6+0.12=0.88+0.12+5.6=1+5.6=6.6
1.78+3.5+0.22=1.78+0.22+3.5=2+3.5=5.5
5.6+2.08+14.4 =5.6+14.4+2.08=20+2.08=22.08
⑵运用加法结合律进行简便计算
2.3+(0.56+4.7) =(2.3+4.7)+0.56 =7+0.56 =7.56
28.6+0.54+0.46+1.4 =(28.6+1.4)+(0.54+0.46) =30+1 =31
5.82+4.56+5.44 =5.82+(4.56+5.44) =5.82+10=15.82
⑶、运用乘法交换律进行简便计算。
25×0.37×0.4=25×0.4×0.37=10×0.37=3.7
7.5×0.39×4 =7.5×4×0.39 =30×0.39 =11.7
6.5×1.1×4 =6.5×4×1.1 =26×1.1 =2.86
1.25×3.9×0.8=1.25×0.8×3.9=1×3.9 =3.9
⑷、运用乘法结合律进行简便计算。
1.9×7.5×8=1.9×(7.5×8) =1.9×60=114
6.2×0.8×2.5=6.2×(0.8×2.5) =6.2×2 =12.4
4.3×1.5×6=4.3×(1.5×6) =4.3×9 =38.7
4.1×3.5×2 =4.1×(3.5×2)=4.1×7=28.7
⑸、运用乘法分配律的加法进行简算。
13.6×4.6+4.6×6.4=(13.6+6.4)×4.6=20×4.6 =92
0.72×23+77×0.72 =(23+77)×0.72=100×0.72 =72
2.6×32+32×2.4 =(2.6+2.4) ×32 =5×32 =160
⑹、运用乘法分配律的减法进行简算。
12×5.9-5.9×2=(12-2) ×5.9 =10×5.9=59
4.6×2.5-2.5×0.6 =(4.6-0.6)×2.5=4×2.5 =10
101×9.7-9.7 =(101-1)×9.7=100×9.7=970
⑺、运用减法的运算规律进行简便计算。
1.8-0.45-0.55=1.8-(0.45+0.55) =1.8-1 =0.8
54.4-4.6-5.4=54.4-(4.6+5.4) =54.4-10=44.4
35.6-0.13-0.47=35.6-(0.13+0.47)=35.6-0.6=35
⑻、运用除法的运算规律进行简便计算。
4.5÷4÷7.5=4.5÷(4×7.5)=4.5÷30=0.15
14.8÷1.25÷8=14.8÷(1.25×8)=14.8÷10 =1.48
18.5÷4÷1.25=18.5÷(4×1.25)=18.5÷5 =3.7
5 .4÷4÷0.45 =5.4÷(4×0.45) =5.4÷0.18=30
⑼综合运用各种运算定律进行简算。
2.54+2.46+0.44+0.54 =(2.54+2.46)+(0.44+0.54)=5+1 =6
10.7×0.4-6.7×0.4=(10.7-6.7)×0.4=4×0.4 =1.6
0.5×3.2×1.25 =(0.5×4)×(0.8×1.25) =2×1 =2
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2214+638+286
3065-738-1065
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2357-183-317-357
2365-1086-214
497-299
2370+1995
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(12+24+80)×50
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88×125
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16800÷120
30100÷2100
32000÷400
49700÷700
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3150÷15
4800÷25
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