题目内容
569+68+132+31 | 38×25×4 | 2300-165-35 | 125×(8+4) |
3200÷25÷4 | 23×32+68×23 | 25×204 | 56×32-46×32. |
分析:(1)运用加法交换律和结合律简算;
(2)运用乘法结合律简算;
(3)根据连续减去两个数,等于减去这两个数的和简算;
(4)(6)(8)运用乘法分配律简算;
(5)根据连续除以两个数等于除以这两个数的积简算;
(7)先把204分解成200+4,再运用乘法分配律简算.
(2)运用乘法结合律简算;
(3)根据连续减去两个数,等于减去这两个数的和简算;
(4)(6)(8)运用乘法分配律简算;
(5)根据连续除以两个数等于除以这两个数的积简算;
(7)先把204分解成200+4,再运用乘法分配律简算.
解答:解:(1)569+68+132+31,
=(569+31)+(68+132),
=600+200,
=800;
(2)38×25×4,
=38×(25×4),
=38×100,
=3800;
(3)2300-165-35,
=2300-(165+35),
=2300-200,
=2100;
(4)125×(8+4),
=125×8+125×4,
=1000+500,
=1500;
(5)3200÷25÷4,
=3200÷(25×4),
=3200÷100,
=32;
(6)23×32+68×23,
=23×(32+68),
=23×100,
=2300;
(7)25×204,
=25×(200+4),
=25×200+25×4,
=5000+100,
=5100;
(8)56×32-46×32,
=(56-46)×32,
=10×32,
=320.
=(569+31)+(68+132),
=600+200,
=800;
(2)38×25×4,
=38×(25×4),
=38×100,
=3800;
(3)2300-165-35,
=2300-(165+35),
=2300-200,
=2100;
(4)125×(8+4),
=125×8+125×4,
=1000+500,
=1500;
(5)3200÷25÷4,
=3200÷(25×4),
=3200÷100,
=32;
(6)23×32+68×23,
=23×(32+68),
=23×100,
=2300;
(7)25×204,
=25×(200+4),
=25×200+25×4,
=5000+100,
=5100;
(8)56×32-46×32,
=(56-46)×32,
=10×32,
=320.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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