题目

计算下面各题，能简算的要简算。 ①7.27+6.9-6.27+3.1 ②（2.72+0.68）÷0.34 ③5.24×0.76-0.24×0.76 ④6÷2.5×99+2.4 ⑤1.25×[（2.2+1.8）÷10.2] 答案：①7.27+6.9-6.27+3.1 ＝（7.27－6.27）＋（6.9＋3.1） ＝1＋10 ＝11 ②（2.72+0.68）÷0.34 =2.72÷0.34+0.68÷0.34 =8+2 =10 ③5.24×0.76-024×0.76 =（5.24-0.24）×0.76 =5×0.76 =3.8 ④6÷2.5×99+2.4 =2.4×99+2.4 =2.4×（99+1） =2.4×100 =240 ⑤1.25×[（2.2+1.88）÷10.2] =1.25×（4.08÷10.2） =0.5

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