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=
÷[×(-)]
4.9×5+4.9+4.9×3
直接写出得数。6-+= 1-0.675= 1÷20%+0.36+0.4=÷= (+)×12= 1.25×0.9×80=+-+= 2.6×7.5+74×75%=×7÷×7= 199+200+201+202+203+204+205=
5x-12.5=2 3×(2x+7)=45 5.6-4x=3.2
(13×0.58-4.87+0.42×13- 5.13) ×4.25