(1)1.25*6.4*7(2)9.9*7.8+0.78(3)0.77/0.55(4)7.5*1.02(5)3.7*2.
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(1)1.25*6.4*7(2)9.9*7.8+0.78(3)0.77/0.55(4)7.5*1.02(5)3.7*2.8+12.5的简便计算.
(1)1.25*6.4*7
=1.25*0.8*8*7
=1*56
=56
(2)9.9*7.8+0.78
=99*0.78+0.78
=0.78*(99+1)
=78
(3)0.77/0.55
=0.11*7/0.11*5
=7/5
(4)7.5*1.02
=7.5*(1+0.02)
=7.5+7.5*0.02
=7.2+0.15
=7.35
(5)3.7*2.8+12.5
=3.7*(3-0.2)+12.5
=11.1-0.74+12.5
=23.6-0.74
=22.86
=1.25*0.8*8*7
=1*56
=56
(2)9.9*7.8+0.78
=99*0.78+0.78
=0.78*(99+1)
=78
(3)0.77/0.55
=0.11*7/0.11*5
=7/5
(4)7.5*1.02
=7.5*(1+0.02)
=7.5+7.5*0.02
=7.2+0.15
=7.35
(5)3.7*2.8+12.5
=3.7*(3-0.2)+12.5
=11.1-0.74+12.5
=23.6-0.74
=22.86
(1)1.25*6.4*7(2)9.9*7.8+0.78(3)0.77/0.55(4)7.5*1.02(5)3.7*2.
简便计算:(1)3.4×7.8÷3.9(2)85÷0.17÷5(3)0.125×(2.4+0.8)×2.5(4)9.9×
6.4×125%+1又5分之3÷(1-5分之1)+2×1.25
-2/3+(-1/6)-(-1/4)-1/2=?(-7.8)×1.25×(-8)=?
计算:0.12(2)+0.23(3)+0.34(4)+0.45(5)+0.56(6)+0.67(7)+0.78(8)+0
3.7×(-2/3)-0.54×(-2/7)+1/3×(-3/7)+5/7×0.54 简便方法,要
计算:0.77×【7/10÷(2/7×5)】=?解比例:3/20:X=9:1
2又3|5吨=()吨()千克;4又1|20平方米=()平方米()平方分米;1.02升=()升()毫升;
找规律,填一填 (1) 10.24,6.4,4,(),() (2) 8,6.4,5.12,()...
(1)1.25*0.25*32(2)5/7+9/8*5/9+3/8(3)(3/7+5/14)/11/21-2/5能简算的
(﹣4)×(+8)×(﹣6分之1)×(﹣7.5) (2)13又7分之5×16分之3
(1)1.25乘808等于多少 (2) 8.75乘1.02等于多少 (3)0.85乘0.32等于多少