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3.8ⅹ0.79

3.8ⅹ0.79

3.8×0.79 0.38×0.21的简便运算

3.8×0.79 0.38×0.21的简便运算

3.8×0.79 0.38×0.21

=3.8*(0.79+0.21)

=3.8*1

=3.8

9.4X3.8+0.62X94怎样简便计算?

9.4×3.8+0.62×94

=9.4×3.8+6.2×9.4

=9.4ⅹ(3.8+6.2)

=9.4x10

=94

3.8ⅹ(x 8)=64.6的解

3.8ⅹ(x 8)=64.6的解

x 8=64.6 ÷3.8

x 8=17

把中间的符号代入

3.8ⅹ1.25一1.25十7.2ⅹ1.25

3.8ⅹ1.25一1.25十7.2ⅹ1.25

=1.25ⅹ(3.8-1+7.2)

=1.25ⅹ10

=12.5