递等式计算,能简算的要简算.4.8×0.252.33×0.5×41.2×2.5+0.8×2.550.4×1.9-1.93.7×0.25+40.65×201.
答案:2 悬赏:40 手机版
解决时间 2021-01-04 16:31
- 提问者网友:黑米和小志
- 2021-01-03 23:54
递等式计算,能简算的要简算. 4.8×0.252.33×0.5×41.2×2.5+0.8×2.550.4×1.9-1.93.7×0.25+40.65×201.
最佳答案
- 五星知识达人网友:一袍清酒付
- 2021-01-04 00:24
解:(1)4.8×0.25,
=1.2×4×0.25,
=1.2×(4×0.25),
=1.2×1,
=1.2;
(2)2.33×0.5×4,
=2.33×(0.5×4),
=2.33×2,
=4.66;
(3)1.2×2.5+0.8×2.5,
=(1.2+0.8)×2.5,
=2×2.5,
=5;
(4)50.4×1.9-1.9,
=(50.4-1)×1.9,
=49.4×1.9,
=93.86;
(5)3.7×0.25+4,
=0.925+4,
=4.925;
(6)0.65×201,
=0.65×(200+1),
=0.65×200+0.65×1,
=130+0.65,
=130.65.解析分析:(1)先把4.8分解成1.2×4,再运用乘法结合律简算;
(2)运用乘法结合律简算;
(3)(4)运用乘法分配律简算;
(5)先算乘法,再算加法;
(6)先把201分解成200+1,再运用乘法分配律简算.点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
=1.2×4×0.25,
=1.2×(4×0.25),
=1.2×1,
=1.2;
(2)2.33×0.5×4,
=2.33×(0.5×4),
=2.33×2,
=4.66;
(3)1.2×2.5+0.8×2.5,
=(1.2+0.8)×2.5,
=2×2.5,
=5;
(4)50.4×1.9-1.9,
=(50.4-1)×1.9,
=49.4×1.9,
=93.86;
(5)3.7×0.25+4,
=0.925+4,
=4.925;
(6)0.65×201,
=0.65×(200+1),
=0.65×200+0.65×1,
=130+0.65,
=130.65.解析分析:(1)先把4.8分解成1.2×4,再运用乘法结合律简算;
(2)运用乘法结合律简算;
(3)(4)运用乘法分配律简算;
(5)先算乘法,再算加法;
(6)先把201分解成200+1,再运用乘法分配律简算.点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
全部回答
- 1楼网友:轻熟杀无赦
- 2021-01-04 01:50
正好我需要
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