估算:49÷5≈ 50÷2≈ 61÷5≈ 62÷3≈
0.9+0.42=53.9﹣5.9=5.4+4.6×5=0.25×4÷0.25×4=4÷3.3=(商用循环小数表示)
用竖式计算.2.5+2.7= ; 41×24= ; 6.1﹣5.6= ; 29×53= .
列竖式计算,带*的要验算.14.8+8.65= 16.3﹣6.77= *103﹣39.98=
直接写得数2.7﹣0.7= 8.3+0.05= 1.75+8.25= 2.21﹣1.1=0.28+0.2= 0.6+0.3= 8.8﹣0.5= 0.88﹣0.08=
用竖式计算.5.9+0.3= 10﹣1.5= 23×91= 56×24=