题目内容
201×24 | 95×32+32+4×32 |
125×5×8×6 | 125×32 |
282+53+37+18 | 99×38+38 |
540÷36 | 5400-1856-144 |
25×32×125. |
分析:①201×24,运用乘法分配律进行简算;
②95×32+32+4×32,运用乘法分配律进行简算;
③125×5×8×6,运用乘法交换律和结合律进行简算;
④125×32,把32 拆分为;8×4,运用乘法结合律进行简算;
⑤282+53+37+18,运用加法交换律和结合律进行简算;
⑥99×38+38,运用乘法分配律进行简算;
⑦540÷36,根据除法的运算性质进行简算;
⑧5400-1856-144,根据减法的运算性质进行简算;
⑨25×32×125,把把32 拆分为;4×8,运用乘法结合律进行简算;
②95×32+32+4×32,运用乘法分配律进行简算;
③125×5×8×6,运用乘法交换律和结合律进行简算;
④125×32,把32 拆分为;8×4,运用乘法结合律进行简算;
⑤282+53+37+18,运用加法交换律和结合律进行简算;
⑥99×38+38,运用乘法分配律进行简算;
⑦540÷36,根据除法的运算性质进行简算;
⑧5400-1856-144,根据减法的运算性质进行简算;
⑨25×32×125,把把32 拆分为;4×8,运用乘法结合律进行简算;
解答:解:①201×24,
=200×24+1×24,
=2400+24,
=2424;
②95×32+32+4×32,
=(95+4+1)×32,
=100×32,
=3200;
③125×5×8×6,
=(125×8)×(5×6),
=1000×30,
=30000;
④125×32,
=125×8×4,
=1000×4,
=4000;
⑤282+53+37+18,
=(282+18)+(53+37),
=300+90,
=390;
⑥99×38+38,
=(99+1)×38,
=100×38,
=3800;
⑦540÷36,
=540÷9÷4,
=60÷4,
=15;
⑧5400-1856-144,
=5400-(1856+144),
=5400-2000,
=3400;
⑨25×32×125,
=(25×4)×(8×125),
=100×1000,
=100000.
=200×24+1×24,
=2400+24,
=2424;
②95×32+32+4×32,
=(95+4+1)×32,
=100×32,
=3200;
③125×5×8×6,
=(125×8)×(5×6),
=1000×30,
=30000;
④125×32,
=125×8×4,
=1000×4,
=4000;
⑤282+53+37+18,
=(282+18)+(53+37),
=300+90,
=390;
⑥99×38+38,
=(99+1)×38,
=100×38,
=3800;
⑦540÷36,
=540÷9÷4,
=60÷4,
=15;
⑧5400-1856-144,
=5400-(1856+144),
=5400-2000,
=3400;
⑨25×32×125,
=(25×4)×(8×125),
=100×1000,
=100000.
点评:此题考查的目的是理解掌握加法、乘法的运算定律和减法、乘法的运算性质,并且能够灵活运用这些运算定律和运算性质进行简便计算.
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