Question

用简便方法计算：3.4X1.02.12.5X(9.3-0.7-0.6+0.8)

Answer 1

3.4*1.02=(3+0.4)*1.02=3*1.02+0.4*1.02=3.06+0.408=3.468

12.5*(9.3-0.7-0.6+0.8)=12.5*(9.3-1.3+0.8)=12.5*(8+0.8)=12.5*8+12.5*0.8=100+10=110