求未知数X. (1)8x﹣32×5=80 (2)=.
用竖式计算。(①②小题要验算)①51×26 = ②904÷3=③6.2+3.9= ④ 836÷4=
口算20×8= 400×5= 36×2= 16×4= 38×0= 540÷9= 125-38= 930÷3= 1500÷3= 7×7-2= 5×9+7=
脱式计算。3.25÷2.5÷4 5 ×0.5÷5 ×0.5 86.27-(28.9+16.27) 1.6×[1÷(2.1-2.09)]
满分练习: 5÷8= 6÷9= 14×=22×= ×= ×=×= ×= ×=×= ×= ×3×= 4×= 0.5×=
试一试(1)45+15×6= (2)250÷5×8= (3)6×5÷2×4= (4)30×3+8= (5)400÷4+20×5= (6)10+12÷3+20=(7)(80÷20+80)÷4= (8)70+(100-10×5)= (9) -= (10) ++= (11)6.3÷0.07= (12) ×13=(13)3-1.95= (14) 0÷=(15) 0.5-= (16)540÷9= (17) -= (18) 0.23+177%=