口算 (1)2+7= (2)9+7= (3)7+4= (4)7+5= (5)8+4= (6)12-9= (7)6+7= (8)13-8= (9)7+7= (10)7+3= (11)8+7= (12)16-8=(13)11-9= (14)4+5= (15)14-8= (16)9+2= (17)5+5= (18)12-8=(19)15-9= (20)17-8=
计算下面各题,能简算的要简算. ⑴0.9+1.08+0.92+0.1 ⑵32.54﹣10.46﹣4.54 ⑶18.73+3.85﹣2.73 ⑷45.6﹣(83.7﹣78.8)
用竖式计算并验算. ⑴5.84+26.36= ⑵10.25﹣9.68= ⑶20﹣12.39= ⑷15.8+16.28=
口算.
算一算.