Question

6.78×2.9+67.8×0.7怎么简便计算？

Answer 1

根据题意，这道数学题用到的简便计算方法是乘法分配律和乘法结合律，原式=6.78*2.9+6.78*7=6.78*（2.9+7+0.1-0.1）=6.78*10-6.78*0.1=67.8-0.678=67.122。

Answer 2

原式=67.122

Answer 3

6.78×2.9+67.8×0.7这道算式的简便运算式子可以列成6.78×2.9+6.78×7＝6.78×（2.9+7）＝6.78×10-0.678＝67.8-0.678＝67.122。通过这样的列式就是这道题的简便运算方法。

Answer 4

6.78x2.9+67.8x0.7的简便计算为6.78x2.9+（6.78x10）x0.7＝6.78x2.9+6.78x10x0.7＝6.78x（2.9+10x0.7）＝6.78x（2.9+7）＝6.78x9.9=6.78x（10-0.1）＝6.78x10-6.78x0.1=67.8-0.678=67.122

Answer 5

6.78×2.9+67.8×0.7怎么简便计算
=6.78×（2.9+0.7）
=6.78×3.6
=6.78×（4-0.4）
=6.78×4-6.78×0.4
=27.12-2.712
=24.408
望采纳 谢谢~~