题目

计算下面各题，能简算的要简算。 ①3.14÷1.25÷0.8 ②14.5-4.5×3.2 ③1.96×3.7+6.3×1.96 ④72÷（3.56+1.24） ⑤1.6×0.25×2.5 ⑥0.36÷[（3.1-3.09）×0.4] 答案：①3.14÷1.25÷0.8 =3.14÷（1.25×0.8） =3.14÷1 =3.14 ②14.5-4.5×3.2 =14.5-14.4 =0.1 ③1.96×3.7+6.3×1.96 =1.96×（3.7＋6.3） =1.96×10 =19.6 ④72÷（3.56+1.24） =72÷4.8 =15 ⑤1.6×0.25×2.5 =4×0.4×0.25×2.5 =（4×0.25）×（0.4×2.5） ＝1×1 ＝1 ⑥0.36÷[（3.1-3.09）×0.4] =0.36÷[0.01×0.4] =0.36÷0.004 =90

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