题目内容
计算下面各题,怎样简便就怎样计算. 184-35-65 |
591+482+118 | 99×126+126 |
125×29×8 | 638-(238-159) | 473+149-73 |
4600÷25÷4 | 125×6×50×8 | (40+4)×25. |
分析:(1)运用减法的性质简算; (2)运用加法结合律简算; (3)把126看作126×1,运用乘法分配律简算;
(4)运用乘法交换律与结合律简算;(5)运用减法的性质以及加法结合律简算;(6)运用加法交换律和结合律简算;(7)运用除法的性质简算;(8)运用乘法交换律和结合律简算;(9)运用乘法分配律简算.
(4)运用乘法交换律与结合律简算;(5)运用减法的性质以及加法结合律简算;(6)运用加法交换律和结合律简算;(7)运用除法的性质简算;(8)运用乘法交换律和结合律简算;(9)运用乘法分配律简算.
解答:解:(1)184-35-65,
=184-(35+65),
=184-100,
=84;
(2)591+482+118,
=591+(482+118),
=591+600,
=1191;
(3)99×126+126,
=(99+1)×126,
=100×126,
=12600;
(4)125×29×8,
=(125×8)×29,
=1000×29,
=29000;
(5)638-(238-159),
=638-238+159,
=400+159,
=559;
(6)473+149-73,
=473-73+149,
=400+149,
=549;
(7)4600÷25÷4,
=4600÷(25×4),
=4600÷100,
=46;
(8)125×6×50×8,
=125×8×(6×50),
=1000×300,
=300000;
(9)(40+4)×25,
=40×25+4×25,
=1000+100,
=1100.
=184-(35+65),
=184-100,
=84;
(2)591+482+118,
=591+(482+118),
=591+600,
=1191;
(3)99×126+126,
=(99+1)×126,
=100×126,
=12600;
(4)125×29×8,
=(125×8)×29,
=1000×29,
=29000;
(5)638-(238-159),
=638-238+159,
=400+159,
=559;
(6)473+149-73,
=473-73+149,
=400+149,
=549;
(7)4600÷25÷4,
=4600÷(25×4),
=4600÷100,
=46;
(8)125×6×50×8,
=125×8×(6×50),
=1000×300,
=300000;
(9)(40+4)×25,
=40×25+4×25,
=1000+100,
=1100.
点评:此题考查了运算定律与简便计算,注意分析式中数据,灵活运用运算定律进行简便计算.
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