题目

计算下面各题,能简算的要简算。 ①17.5-5.8-1.2 ②3.6+5.4÷4.5 ③ ④ ⑤ ⑥ 答案:解:①17.5-5.8-1.2 =17.5-(5.8+1.2) =17.5-7 =10.5; ②3.6+5.4÷4.5 =3.6+1.2 =4.8; ③ 56×815×1.5 = 49×1.5 = 23 ; ④ 29×37+79×37 = (29+79)×37 =1× 37 = 37 ; ⑤ 89×27−32÷34 =24-2 =22; ⑥ 910÷[(56−23)×35] = 910÷(56×35−23×35) = 910÷(12−25) = 910÷110 =9.
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