Question

78.9×0.9+7.89x10怎么用简便运算？

Answer 1

78.9×0.9+7.89×10
=7.89×9+7.89×10
=7.89×（9+10）=149.91

Answer 2

这是小学五年级数学简便运算内容，一般都是用乘法交换律结合律和分配率解决，具体解答过程如下:
78.9×0.9+7.89×10
=78.9×0.9+78.9×1
=78.9×(0.9+1)
=78.9×1.9
=149.91
希望我的回答对您有帮助！！

Answer 3

=78.9×（1－0.1）+78.9=78.9－7.89+78.9=71.01+78.9=149.91

Answer 4

78.9×0.9+7.89×10
=7.89×9+7.89×10
=7.89×(9+10)
=7.89×19
=7.89×(20-1)
=7.89×20-7.89×1
=157.8-7.89
=157.8-7.8-0.09
=150-0.09
=149.91

Answer 5

78.9*0.9+7.89*10
=78.9*0.9+78.9*1
=78.9*1.9=149.91