能简算的要简算
0.76×230-30??
9.2×l.85+3.65??
(7.39+7.39+7.39+7.39)×2.5
0.78×101??
0.25×28??
4.2×l.36+1.36×5.8.
能简算的要简算0.76×230-30??9.2×l.85+3.65??(7.39+7.39+7.39+7.39)×2.50.78×101??0.25×28??4.2×
答案:2 悬赏:30 手机版
解决时间 2021-01-03 10:44
- 提问者网友:原来太熟悉了会陌生
- 2021-01-03 04:19
最佳答案
- 五星知识达人网友:由着我着迷
- 2021-01-03 05:42
解:(1)0.76×230-30,
=174.8-30,
=144.8;
(2)9.2×l.85+3.65,
=17.02+3.65,
=20.67;
(3)(7.39+7.39+7.39+7.39)×2.5,
=(7.39×4)×2.5,
=7.39×(4×2.5),
=7.39×10,
=73.9;
(4)0.78×101,
=0.78×(100+1),
=0.78×100+0.78,
=78+0.78,
=78.78;
(5)0.25×28,
=0.25×(4×7),
=(0.25×4)×7,
=1×7,
=7;
(6)4.2×l.36+1.36×5.8,
=(4.2+5.8)×l.36,
=10×1.36,
=13.6.解析分析:(1)先算乘法,再算减法;
(2)先算乘法,再算加法;
(3)根据乘法结合律进行计算;
(4)根据乘法分配律进行计算;
(5)根据乘法结合律进行计算;
(6)根据乘法分配律进行计算.点评:此题主要考查小数的四则混合运算的运算顺序和应用运算定律进行简便计算.
=174.8-30,
=144.8;
(2)9.2×l.85+3.65,
=17.02+3.65,
=20.67;
(3)(7.39+7.39+7.39+7.39)×2.5,
=(7.39×4)×2.5,
=7.39×(4×2.5),
=7.39×10,
=73.9;
(4)0.78×101,
=0.78×(100+1),
=0.78×100+0.78,
=78+0.78,
=78.78;
(5)0.25×28,
=0.25×(4×7),
=(0.25×4)×7,
=1×7,
=7;
(6)4.2×l.36+1.36×5.8,
=(4.2+5.8)×l.36,
=10×1.36,
=13.6.解析分析:(1)先算乘法,再算减法;
(2)先算乘法,再算加法;
(3)根据乘法结合律进行计算;
(4)根据乘法分配律进行计算;
(5)根据乘法结合律进行计算;
(6)根据乘法分配律进行计算.点评:此题主要考查小数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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- 1楼网友:从此江山别
- 2021-01-03 06:10
我好好复习下
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