Question

28.9×72.8+2.72×289，用简便方法怎么算求解答？

Answer 1

这条算法可以变成二百八十九乘以七点二八加上二点七二乘以二百八十九，这样就可以换算为七点二八加上二点七二再乘以二百八十九，得到结果二千八百九十。望采纳。

Answer 2

28.9×72.8+2.72×289
=289×7.28+2.72x289
=289x（7.28+2.72）
=289x10
=2890

Answer 3

28.9×72.8+2.72×289
＝28.9×72.8+27.2×28.9
＝28.9×（72.8+27.2）
＝28.9×100
＝2890

Answer 4

=28.9×72.8＋27.2×28.9
=(72.8＋27.2)×28.9
=100×28.9
=2890

Answer 5

运用乘法结合律和乘法分配律
28.9×72.8+27.2×28.9
=28.9×（72.8+27.2）
=28.9×100
=2890