125+4.6+0.75简便计算
问题描述：
125+4.6+0.75简便计算
答
125+4.6+0.75=125+4+0.6+0.75=（125+4）+（0.6+0.75）=129+1.35=130.353.4*7*1.5=3.4*10.5=3.4*（10+0.5）=3.4*10+3.4*0.5=34+1.7=35.754.9*0.38=54.9*（0.4-0.02）=54.9*0.4-54.9*0.02=21.96-1.098=20.8624.05+37.85=4+0.05+37.85=4+37.9=41.92.96*40=（3-0.04）*40=3*40-0.04*40=120-1.6=118.4