Question

4.82×7.8-0.78×38.2,怎样简便运算？

Answer 1

4.82×7.8-0.78×38.2
=4.82×7.8-7.8×3.82
=（4.82-3.82）×7.8
=1×7.8
=7.8

Answer 2

4.82×7.8-0.78×38.2

=4.82×7.8 - 7.8×3.82..............根据积的变化规律，改写

=7.8×（4.82-3.82）............乘法的分配律，合并

=7.8×1

=7.8

Answer 3

4.82×7.8-0.78×38.2
=4.82×7.8-0.78×3.82x10
=4.82×7.8-7.8×3.82
=7.8x（4.82-3.82）
=7.8x1
=7.8

Answer 4

很简单，简便的话一般找相同项，互补项等等。这里0.78可以等于7.8*0.1。这样计算就简便了。
4.82*7.8-0.78*38.2
=4.82*7.8-7.8*0.1*38.2
=4.82*7.8-3.82*7.8
=（4.82-3.82）*7.8
=1*7.8
=7.8

Answer 5

4.82×7.8-0.78×38.2=4.82×7.8-7.8×38.2÷10=7.8×(4.82-3.82)=7.8
或者把7.8换成0.78
4.82×7.8-0.78×38.2=4.82×10×0.78-0.78×38.2=0.78×(48.2-38.2)=7.8
希望能帮到你哈（ '▿ ' ）