题目

脱式计算,能简算的要简算。 ①1.25×3.2×0.25 ②14.5×102 ③14.64+3.7×2.8 ④4.8×56.7+0.567×520 ⑤8.7÷0.2÷0.5 答案:①1.25×3.2×0.25 =(1.25×0.8)×(0.25×4) =1×1 =1 ②14.5×102 =14.5×100+14.5×2 =1450+29 =1479 ③14.64+3.7×2.8 =14.64+10.36 =25 ④4.8×56.7+0.567×520 =4.8×56.7+5.2×56.7 =(4.8+5.2)×56.7 =10×56.7 =567 ⑤8.7÷0.2÷0.5 =8.7÷(0.2×0.5) =8.7÷0.1 =87
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