题目内容
用简便方法计算下面各题. 573-298 |
194+501 |
627-(427+189) |
630÷14 | 125×25×32 | 210÷6÷5. |
分析:(1)573-298,运用减法的运算性质进行简算;
(2)194+501,运用加法的运算性质进行简算;
(3)627-(427+189),运用减法的运算性质进行简算;
(4)630÷14,运用除法的运算性质进行简算;
(5)125×25×32,运用乘法交换律和结合律进行简算;
(6)210÷6÷5,运用除法的运算性质进行简算.
(2)194+501,运用加法的运算性质进行简算;
(3)627-(427+189),运用减法的运算性质进行简算;
(4)630÷14,运用除法的运算性质进行简算;
(5)125×25×32,运用乘法交换律和结合律进行简算;
(6)210÷6÷5,运用除法的运算性质进行简算.
解答:解:(1)573-298,
=573-300+2,
=275;
(2)194+501,
=194+500+1,
=695;
627-(427+189),
=627-427-189,
=11;
(4)630÷14,
=630÷7÷2,
=90÷2,
=45;
(5)125×25×32,
=(125×8)×(25×4),
=1000×100,
=100000;
(6)210÷6÷5,
=210÷(6×5),
=210÷30,
=7.
=573-300+2,
=275;
(2)194+501,
=194+500+1,
=695;
627-(427+189),
=627-427-189,
=11;
(4)630÷14,
=630÷7÷2,
=90÷2,
=45;
(5)125×25×32,
=(125×8)×(25×4),
=1000×100,
=100000;
(6)210÷6÷5,
=210÷(6×5),
=210÷30,
=7.
点评:此题考查的目的是运用加法、减法、除法的运算性质和乘法的运算定律进行简便计算.
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