Question

四年级23×98+2×77×94的简便运算是什么?

Answer 1

可运用乘法分配律，简便运算如下：
23×98+2×77×94
=23×98+77×188
=23×98+77×98+77×90
=（23+77）×98+77×100-77×10
=100×98+7700-770
=9800+7700-770
=17500-770
=16730

Answer 2

23*98+2*77*94
=23*（88+10）+2*94*77
=23*88+23*10+188*77
=23*88+230+（100+88）*77
=23*88+230+100*77+88*77
=23*88+77*88+230+7700
=（23+77）*88+230+7700
=100*88+7700+230
=8800+7700+230
=16500+230
=16730