7.9x2.8-8.6x0.2,的简便运算
1个回答
关注
展开全部
7.9x2.8-8.6x0.2=8×2.8-0.1×2.8-1.72=22.4-0.28-1.72=22.4-(1.72+0.28)=22.4-2=20.4
咨询记录 · 回答于2022-10-07
7.9x2.8-8.6x0.2,的简便运算
7.9x2.8-8.6x0.2=8×2.8-0.1×2.8-1.72=22.4-0.28-1.72=22.4-(1.72+0.28)=22.4-2=20.4
简便计算方法如下7.9x2.8-8.6x0.2=( 8-0.1)×2.8-1.72=8×2.8-0.1×2.8-1.72=22.4-0.28-1.72=22.4-(0.28+1.72)=22.4-2=20.4