口算下面各题 (1)2.5+3.2= (2)9.8-4.8= (3)1.29-0.18= (4)2.26+0.9= (5)8-0.82= (6)0.75+0.25= (7)1.4+0.5= (8)10.8-8.5= (9)6.4+1.07= (10)0.55+5.5= (11)1.05-0.09= (12)0.6+6.45=
用竖式计算. 3.85+9.66 41.5﹣15.7.
653.54+17.16=★ 70﹣23.23=
直接写出得数: 5.4+8.5= 150×6= 6.78+0.23= 10﹣6.5+3.5= 7.5×100= 60×50= 287﹣199= 0.3×125×8= 1﹣0.09= 927÷9= 60÷100= 6.3×99+6.3= 0.61×99≈ 6.9×8.1≈ 71.9÷8.9≈ 3.5+0.78+6.5=
列竖式计算.(带*的题要验算) 42.3+15.9= 10﹣3.8= *15×68= 32×26=
计算下面各题,并且验算: 41.2﹣15.6 21.56+6.74.