问题
解答题
脱式计算,能简便运算的要简便运算
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答案
(1)770÷5÷77,
=770÷77÷5,
=10÷5,
=2;
(2)39+144+61,
=(39+61)+144,
=100+144,
=244;
(3)27×4×5,
=27×(4×5),
=27×20,
=540;
(4)857-318-182,
=857-(318+182),
=857-500,
=357;
(5)240÷3÷8,
=240÷(3×8),
=240÷24,
=10.