题目

递等式计算(能巧算的要巧算) ①54+46×10 ②(620+190)÷90 ③53×106-53×6 ④720÷80×26 ⑤250×(576÷64) ⑥25×12÷75 答案:解:①54+46×10 =54+460 =514 ②(620+190)÷90 =810÷90 =9 ③53×106-53×6 =(106-6)×53 =100×53 =5300 ④720÷80×26 =9×26 =234 ⑤250×(576÷64) =250×9 = 2250 ⑥25×12÷75 =300÷75 =4
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