Question

简便计算 6.2×1.02 1.25 ×99 12.5×32×2.5 4.12-1.78-1.22 4.2÷0.7÷6

Answer 1

6.2×1.02 =6.2*1+6.2*0.02=6.324

1.25*99=1.25*100-1.25=125-1.25=123.75

12.5*32*2.5=12.5*8*4*2.5=100*10=1000

4.12-1.78-1.22=4.12-（1.78+1.22）=4.12-3=1.12

（4.2/0.7）/6=4.2/（0.7*6）=4.2/4.2=1