Question

8.12×2.1+81.2×0.83-82×0.4的简便计算

Answer 1

问：8.12×2.1+81.2×0.83-82×0.4的简便计算

答：亲亲，你看一下你的题目，好像有点问题呢

问：好的

答：最后面82×0.4应该是81.2×0.4

问：82×0.4

答：亲亲，你的题保证有问题，你肯定抄错题了，不然没有简便方法的8.12×2.1+81.2×0.83-81.2×0.4=（8.12×10）×（2.1÷10）+81.2×0.83-81.2×0.4=81.2×0.21+81.2×0.83-81.2×0.4=81.2×（0.21+0.83－0.4)=81.2×1=81.2

答：亲亲这样8.12×2.1+81.2×0.83-8.12×0.4=（8.12×10）×（2.1÷10）+81.2×0.83-81.2×0.04=81.2×0.21+81.2×0.83-81.2×0.04=81.2×（0.21+0.83－0.04)=81.2×1=81.2