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(6.4+0.32)÷0.8的简便运算怎么做,求解答

(6.4+0.32)÷0.8 =6.4÷0.8+0.32÷0.8 =64÷8+3.2÷8 =8+0.4 =8.4

原式=2+0.24×(6.4÷0.32) =2+0.24×20 =2+4.8 =6.8

(1)2.5×45+6.5×80%+0.8,=0.8×(2.5+6.5+1),=0.8×10,=8;(2)3.8×4.2+38×0.58,=3.8×(4.2+5.8),=3.2×10,=32;(3)47.5-(0.6+6.4÷0.32),=47.5-(0.6+20),=47.5-20.6,=26.9;(4)40÷[47×(12+38)],=40÷[47×78],=40÷12,=80;...

3.2╳1.5+6.4÷0 .32简便方法 3.2╳1.5+6.4÷0 .32 =4.8+50 =54.8 直接计算

7.25一(32.4一11.6)÷6.4 =7.25一20.8÷6.4 =7.25-3.25 =4

=32x(-0.1x35.5-0.2x23.1-0.01x183) =32x(-3.55-4.62-1.83) =32x(-10) =-320 提取公约数32,或-32亦可

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