题目

计算下面各题,能简算的要简算。 ①0.11×1.8+8.2×0.11 ②7.2÷0.5÷0.2 ③44×2.5×0.9 ④3.4÷1.7+5.1÷1.7 ⑤0.25×12.5×3.2 ⑥1.7×101-1.7 答案:①0.11×1.8+8.2×0.11 =0.11×(1.8+8.2) =0.11×10 =1.1 ②7.2÷0.5÷0.2 =7.2÷(0.5×0.2) =7.2÷0.1 =72 ③44×2.5×0.9 =11×4×2.5×0.9 =(4×2.5)×(11×0.9) =10×9.9 =99 ④3.4÷1.7+5.1÷1.7 =2+3 =5 ⑤0.25×12.5×3.2 =0.25×12.5×0.8×4 =(0.25×4)×(12.5×0.8) =1×10 =10 ⑥1.7×101-1.7 =1.7×101-1.7×1 =1.7×(101-1) =1.7×100 =170
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