题目内容
计算下面各题,能简算的要简算.
(1)125×32 | (2)195×115-195×15 | (3)25+75-25+75 |
(4)99×38+38 | (5)3200÷4÷25 | (6)273-73-27. |
分析:(1)根据乘法结合律进行计算;
(2)根据乘法分配律进行计算;
(3)根据加法交换律和结合律进行计算;
(4)根据乘法分配律进行计算;
(5)根据连除的性质进行计算;
(6)根据连减的性质进行计算.
(2)根据乘法分配律进行计算;
(3)根据加法交换律和结合律进行计算;
(4)根据乘法分配律进行计算;
(5)根据连除的性质进行计算;
(6)根据连减的性质进行计算.
解答:解:
(1)125×32,
=125×(8×4),
=(125×8)×4,
=1000×4,
=4000;
(2)195×115-195×15,
=195×(115-15),
=195×100,
=19500;
(3)25+75-25+75,
=(25-25)+(75+75),
=0+150,
=150;
(4)99×38+38,
=(99+1)×38,
=100×38,
=3800;
(5)3200÷4÷25,
=3200÷(4×25),
=3200÷100,
=32;
(6)273-73-27,
=273-(73+27),
=273-100,
=173.
(1)125×32,
=125×(8×4),
=(125×8)×4,
=1000×4,
=4000;
(2)195×115-195×15,
=195×(115-15),
=195×100,
=19500;
(3)25+75-25+75,
=(25-25)+(75+75),
=0+150,
=150;
(4)99×38+38,
=(99+1)×38,
=100×38,
=3800;
(5)3200÷4÷25,
=3200÷(4×25),
=3200÷100,
=32;
(6)273-73-27,
=273-(73+27),
=273-100,
=173.
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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