直接写得数．400×12= 70×200= 122×40= 190×2=250+80= 4×16= 720÷9= 32×50=
直接写出得数． 1.53﹣0.5= 7.8+0.9= 1+= 12÷0.4= 0.56+4.44= 2，9+3.7+2.1= 4×0.25= 1.25×5×8= 7.6×8+2.4×8=
直接写出得数． 0.42×0.5= 0.51÷1.7= 5.2÷0.13= 99×1.01= 13.5﹣2.8﹣7.2= 32.8+19= 1.06×0.4=+= 1﹣= 25×0.32×125=
口算．+=﹣=+=﹣=+=+=﹣= 2﹣= 1﹣﹣=
直接写出得数．﹣=+=+=+= 1﹣=﹣= 3+=﹣= 3﹣1=+=+=+3=
．
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= 12÷0.4=
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=
= 25×0.32×125=
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= 2﹣
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