题目内容
怎样简便就怎样算;
168-52-48 | 125×88 | 1300÷25÷4 | 688-534+112 | 8×(29×l25) |
分析:(1)根据连减的性质进行计算;
(2)根据乘法交换律和结合律进行计算;
(3)根据连除的性质进行计算;
(4)先算减法,再算加法;
(5)根据乘法交换律和结合律进行计算.
(2)根据乘法交换律和结合律进行计算;
(3)根据连除的性质进行计算;
(4)先算减法,再算加法;
(5)根据乘法交换律和结合律进行计算.
解答:解:
(1)168-52-48,
=168-(52+48),
=168-100,
=68;
(2)125×88,
=125×(8×11),
=(125×8)×11,
=1000×11,
=11000;
(3)1300÷25÷4,
=1300÷(25×4),
=1300÷100,
=13;
(4)688-534+112,
=154+112,
=266;
(5)8×(29×l25),
=29×(8×l25),
=29×1000,
=29000.
(1)168-52-48,
=168-(52+48),
=168-100,
=68;
(2)125×88,
=125×(8×11),
=(125×8)×11,
=1000×11,
=11000;
(3)1300÷25÷4,
=1300÷(25×4),
=1300÷100,
=13;
(4)688-534+112,
=154+112,
=266;
(5)8×(29×l25),
=29×(8×l25),
=29×1000,
=29000.
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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