题目

递等式计算,能巧算的要巧算. ①4987+113×33 ②64000÷125÷8 ③(401﹣389)×36 ④136×99+136 ⑤(359﹣42)×53+47 ⑥1300÷25×4 答案:解:①4987+113×33 =4987+3729 =8716 ②64000÷125÷8 =64000÷(125×8) =64000÷1000 =64 ③(401﹣389)×36 =12×36 =432 ④136×99+136 =136×(99+1) =136×100 =13600 ⑤(359﹣42)×53+47 =317×53+47 =16801+47 =16848 ⑥1300÷25×4 =52×4 =208
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