计 算 (1)11-9= (2)12-4= (3)13-5= (4)11-7= (5)12-3= (6)13-4= (7)11-6= (8)14-5= (9)11-5= (10)11-8= (11)12-5= (12)11-2= (13)14-8= (14)13-6= (15)11-3= (16)12-6= (17)11-1= (18)11-4= (19)13-7= (20)14-7=
口算. 72﹣40= 30÷5= 4×5= 12+29= 4÷1= 6÷6= 35+48= 5×3= 38÷4= 3×0= 32+20= 72﹣8= 20÷4= 6×7= 34÷6= 6×6= 18÷3= 24﹣6= 6+45= 40+27= 28÷4= 8×1= 40÷8= 8×3= 91﹣9= 7+73= 32÷6= 31﹣24= 28﹣7= 5÷8= 16﹣8+24= 100﹣49+10= × =12 ÷ =1.
用竖式计算下面各题. 10.8+30.5 5﹣2.6 15.2﹣4.3 5.9+10.7.
列竖式计算. 7.4+6.58= 8.05﹣2.97= 10﹣5.26= 3.79+43.3=
找朋友.
用竖式计算下面各题. 2.6+4.2 5.6+1.8 3.4+0.8 3.2﹣0.5.