199×0.612.5×3.7+4.3×2.50.8×62.3×12.55.2×10.10.25×13.7×0.42.5×40.4.
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解决时间 2021-01-04 07:30
- 提问者网友:謫仙
- 2021-01-03 15:19
199×0.612.5×3.7+4.3×2.50.8×62.3×12.55.2×10.10.25×13.7×0.42.5×40.4.
最佳答案
- 五星知识达人网友:山河有幸埋战骨
- 2021-01-03 15:32
解:(1)199×0.61,
=(200-1)×0.61,
=200×0.61-1×0.61,
=122-0.61,
=121.39;
(2)2.5×3.7+4.3×2.5,
=2.5×(3.7+4.3),
=2.5×8,
=20;
(3)0.8×62.3×12.5,
=0.8×12.5×62.3,
=10×62.3,
=623;
(4)5.2×10.1,
=5.2×(10+0.1),
=5.2×10+5.2×0.1,
=52+0.52,
=52.52;
(5)0.25×13.7×0.4,
=0.25×0.4×13.7,
=0.1×13.7,
=1.37;
(6)2.5×40.4,
=2.5×4×10.1,
=10×10.1,
=101.解析分析:(1)(2)(4)根据乘法分配律简便计算;
(3)(5)(6)根据乘法交换律,结合律简便计算.点评:考查了小数四则混合运算,关键是熟练掌握运算顺序和运算法则,灵活运用运算律简便计算.
=(200-1)×0.61,
=200×0.61-1×0.61,
=122-0.61,
=121.39;
(2)2.5×3.7+4.3×2.5,
=2.5×(3.7+4.3),
=2.5×8,
=20;
(3)0.8×62.3×12.5,
=0.8×12.5×62.3,
=10×62.3,
=623;
(4)5.2×10.1,
=5.2×(10+0.1),
=5.2×10+5.2×0.1,
=52+0.52,
=52.52;
(5)0.25×13.7×0.4,
=0.25×0.4×13.7,
=0.1×13.7,
=1.37;
(6)2.5×40.4,
=2.5×4×10.1,
=10×10.1,
=101.解析分析:(1)(2)(4)根据乘法分配律简便计算;
(3)(5)(6)根据乘法交换律,结合律简便计算.点评:考查了小数四则混合运算,关键是熟练掌握运算顺序和运算法则,灵活运用运算律简便计算.
全部回答
- 1楼网友:醉吻情书
- 2021-01-03 16:45
对的,就是这个意思
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