如题所述
99乘78加33乘66
=99乘78加99乘22
=(78+22)乘99
=100乘99
=9900
=99乘78加99乘22
=(78+22)乘99
=100乘99
=9900
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第1个回答 2014-05-15
99乘78加33乘66
= 99 x 78 + 99 x 22
=99x (78+22)
=9900
= 99 x 78 + 99 x 22
=99x (78+22)
=9900