题目内容
计算下面各题,能简算的要简算. 32×0.125×25 |
13.76-4.53+2.24-1.47 |
65×10.2-6.5×2 | 15.84-2.17-2.83 |
分析:(1)32=4×8,然后再根据乘法交换律和结合律进行简算;
(2)根据加法交换律和结合律,以及减法的性质进行简算;
(3)根据乘法分配律进行简算;
(4)根据减法的性质进行简算.
(2)根据加法交换律和结合律,以及减法的性质进行简算;
(3)根据乘法分配律进行简算;
(4)根据减法的性质进行简算.
解答:解:(1)32×0.125×25
=(4×8)×0.125×25
=(4×25)×(8×0.125)
=100×1
=100;
(2)13.76-4.53+2.24-1.47
=(13.76+2.24)-(4.53+1.47)
=16-6
=10;
(3)65×10.2-6.5×2
=6.5×102-6.5×2
=6.5×(102-2)
=6.5×100
=650;
(4)15.84-2.17-2.83
=15.84-(2.17+2.83)
=15.84-5
=10.84.
=(4×8)×0.125×25
=(4×25)×(8×0.125)
=100×1
=100;
(2)13.76-4.53+2.24-1.47
=(13.76+2.24)-(4.53+1.47)
=16-6
=10;
(3)65×10.2-6.5×2
=6.5×102-6.5×2
=6.5×(102-2)
=6.5×100
=650;
(4)15.84-2.17-2.83
=15.84-(2.17+2.83)
=15.84-5
=10.84.
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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