问题
解答题
怎样简便就怎样计算
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答案
(1)58×72+28×58,
=(72+28)×58,
=100×58,
=5800;
(2)3000÷125÷8,
=3000÷(125×8),
=3000÷1000,
=3;
(3)486-137-63,
=486-(137+63),
=486-200,
=286;
(4)432÷54+17×54,
=8+918,
=926;
(5)99×78+78,
=(99+1)×78,
=100×78,
=7800;
(6)125×24,
=125×(8×3),
=(125×8)×3,
=1000×3,
=3000.