Question

1.6*7.5*1.25,0.23*1.4 ,9.9*3.

Answer 1

1.6*7.5*1.25=8*0.2*7.5*1.25=（8*1.25）*（0.2*7.5）=10*1.5=15

0.23*1.4=0.23*（1+0.4）=0.23*1+0.23*0.4=0.23+0.092=0.322

9.9*3.6=（10-0.1）*3.6=10*3.6-0.1*3.6=36-0.36=35.64