125×16×50.
计算并验算.7.89+1.56=验算: 10.2﹣6.45=验算:
4.58+16.2= 34.22﹣16.8= 78.8﹣64.35=
计算下面各题并且验算.6.94+1.7815.13﹣13.6.
7.28﹣3.33+1.67=7.28﹣5=2.28 .
用竖式计算并验算.①6.14﹣2.56= ②2790÷31=