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4.8+1.24= 17.4﹣2.8= 1÷0.125= 1.2×0.7= 8a×1.5﹣2a=
直接写得数.72×0.75=1.25×8=2.9+6.1=273+827=
直接写出得数．= = 3.14×8= =1﹣40%= = = 52== = = =
2.5×3.2×1.2572×87.5+87.5×28215××0.4×3.7×4.6+6.4×3.7﹣3.7．
列竖式计算并验算.4.2×1.7= 3.47﹣2.59=
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= 
= 3.14×8= 
=
= 
= 52=
= 
= 
= 
=
×0.4×
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