题目

计算下列各题,能简便的要用简便方法算。 (1) 2.1÷0.25 (2) 3.7×5.4+4.6×3.7 (3) 2.84×0.5÷7.1 (4) (8.5-3.4÷1.7)÷0.13 答案: 2.1÷0.25 =(2.1×4)÷(0.25×4) =8.4÷1 =8.4 3.7×5.4+4.6×3.7 =3.7×(5.4+4.6) =3.7×10 =37 2.84×0.5÷7.1 =1.42÷7.1 =0.2 (8.5-3.4÷1.7)÷0.13 =(8.5-2)÷0.13 =6.5÷0.13 =50
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