题目内容

怎样简便就怎样计算
(1)58×72+28×58 (2)3000÷125÷8 (3)486-137-63
(4)432÷54+17×54 (5)99×78+78 (6)125×24.
分析:(1)根据乘法分配律进行计算;
(2)根据连除的性质进行计算;
(3)根据连减的性质进行计算;
(4)先算除法和乘法,再算加法;
(5)根据乘法分配律进行计算;
(6)根据乘法结合律进行计算.
解答:解:
(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.
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
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