用竖式计算.621×8= 503×7=450×7=34×2=308×4=
口算:2.8÷4×2.5= 1.6+4= 1+0.22= 2﹣+=﹣= 72%÷0.01= ﹣×= ÷÷=0.5×÷×0.5= ﹣×﹣=.
直接写出得数.5.7+11.8+4.3= 2﹣+= (+)×24= 0.32﹣0.22=33×98+66= 10.1×99﹣9.9= 4﹣(+0.5)= :=8×12.5%= =
直接写出得数.0.68+0.32= 32×12.5%= += 40÷50×100%=÷÷= (÷)÷= +÷+= (+)×24=
直接写得数. 8.0﹣2.57= 57+23= 25×4%= 3= 1÷=12×()= 9.8÷0.7= ×9÷×9= ×0= 1.5+0.1=
直接写出得数= = = =8.8×1.25= = = =