计算下列各题(能简算的要简算):4.32÷2.4×1.7;16.2×4.5+3.8×4.5;9.05﹣3.86﹣3.14;7.28+0.72÷0.9.
口算:6﹣2.4=5.3+3.5=4.7+3.6=20×13=24×30=640÷9=
计算下面各题,并且验算:41.2﹣15.6 21.56+6.74.
653.54+17.16=★70﹣23.23=
列竖式计算.(带*的题要验算)42.3+15.9=10﹣3.8=*15×68=32×26=
7+3.3= 550÷5=6.4+5.1= 4.5﹣2.6=