Question

100×6·4+157×3.2–35.7×22简便运算

Answer 1

这道题利用乘法结合律计算，现将6.4写成2*3.2，再将3.2写成32*0.1。
100×6·4+157×3.2–35.7×22
=100*2*3.2+157*3.2-35.7*22
=3.2*（200+157）-35.7*22
=3.2*357-35.7*22
=32*0.1*357-35.7*22
=35.7*（32-22）
=35.7*10
=357

Answer 2

100×6.4+157×3.2-35.7×22
=200×3.2+157×3.2-35.7×22
=357×3.2-35.7×22
=35.7×32-35.7×22
=35.7×（32-22）
=35.7×10=357