计算,能简算的要简算.125×32×25101×87-8756×67+33×569+4.98+1.02+21.113.05+12.38-4.0524.52-(7.5
答案:2 悬赏:60 手机版
解决时间 2021-04-13 14:43
- 提问者网友:泪痣哥哥
- 2021-04-13 04:42
计算,能简算的要简算. 125×32×25101×87-8756×67+33×569+4.98+1.02+21.113.05+12.38-4.0524.52-(7.5+4.52)
最佳答案
- 五星知识达人网友:独行浪子会拥风
- 2021-04-13 05:32
解:(1)125×32×25,
=125×(8×4)×25,
=(125×8)×(4×25),
=1000×100,
=100000;
(2)101×87-87,
=(101-1)×87,
=100×87,
=8700;
(3)56×67+33×56,
=56×(67+33),
=56×100,
=5600;
(4)9+4.98+1.02+21.1,
=(4.98+1.02)+(9+21.1),
=6+30.1,
=36.1;
(5)13.05+12.38-4.05,
=(13.5-4.05)+12.38,
=9+12.38,
=21.38;
(6)24.52-(7.5+4.52),
=24.52-4.52-7.5,
=20-7.5,
=12.5.解析分析:(1)先把32分解成8×4,再运用乘法结合律简算;
(2)(3)运用乘法分配律简算;
(4)根据加法交换律和结合律简算;
(5)运用加法交换律简算;
(6)根据减法的性质简算.点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
=125×(8×4)×25,
=(125×8)×(4×25),
=1000×100,
=100000;
(2)101×87-87,
=(101-1)×87,
=100×87,
=8700;
(3)56×67+33×56,
=56×(67+33),
=56×100,
=5600;
(4)9+4.98+1.02+21.1,
=(4.98+1.02)+(9+21.1),
=6+30.1,
=36.1;
(5)13.05+12.38-4.05,
=(13.5-4.05)+12.38,
=9+12.38,
=21.38;
(6)24.52-(7.5+4.52),
=24.52-4.52-7.5,
=20-7.5,
=12.5.解析分析:(1)先把32分解成8×4,再运用乘法结合律简算;
(2)(3)运用乘法分配律简算;
(4)根据加法交换律和结合律简算;
(5)运用加法交换律简算;
(6)根据减法的性质简算.点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
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- 1楼网友:摆渡翁
- 2021-04-13 05:46
我也是这个答案
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