怎样简便就怎样算.①5.5×17.3+2.7×5.5②1.25×(6.2-5.9)×80③1.5×99④70.3-17.48÷7.6⑤3.64÷52×23.3⑥4.
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解决时间 2021-04-04 15:48
- 提问者网友:谁的错
- 2021-04-04 09:17
怎样简便就怎样算. ①5.5×17.3+2.7×5.5②1.25×(6.2-5.9)×80③1.5×99④70.3-17.48÷7.6⑤3.64÷52×23.3⑥4.6×(1-0.25)+0.75×5.4.
最佳答案
- 五星知识达人网友:人類模型
- 2021-04-04 10:20
解:①5.5×17.3+2.7×5.5,
=5.5×(17.3+2.7),
=5.5×20,
=110;
②1.25×(6.2-5.9)×80,
=1.25×0.3×80,
=1.25×80×0.3,
=100×0.3,
=30;
③1.5×99,
=1.5×(100-1),
=1.5×100-1.5×1,
=150-1.5,
=148.5;
④70.3-17.48÷7.6,
=70.3-2.3,
=68;
⑤3.64÷52×23.3,
=0.07×23.3,
=1.631;
⑥4.6×(1-0.25)+0.75×5.4,
=4.6×0.75+0.75×5.4,
=(4.6+5.4)×0.75,
=10×0.75,
=7.5.解析分析:①运用乘法分配律简算;
②先算小括号里面的减法,再运用乘法交换律简算;
③先把99分解成100-1,再运用乘法分配律简算;
④先算除法,再算减法;
⑤先算除法,再算乘法;
⑥先算小括号里面的减法,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.
=5.5×(17.3+2.7),
=5.5×20,
=110;
②1.25×(6.2-5.9)×80,
=1.25×0.3×80,
=1.25×80×0.3,
=100×0.3,
=30;
③1.5×99,
=1.5×(100-1),
=1.5×100-1.5×1,
=150-1.5,
=148.5;
④70.3-17.48÷7.6,
=70.3-2.3,
=68;
⑤3.64÷52×23.3,
=0.07×23.3,
=1.631;
⑥4.6×(1-0.25)+0.75×5.4,
=4.6×0.75+0.75×5.4,
=(4.6+5.4)×0.75,
=10×0.75,
=7.5.解析分析:①运用乘法分配律简算;
②先算小括号里面的减法,再运用乘法交换律简算;
③先把99分解成100-1,再运用乘法分配律简算;
④先算除法,再算减法;
⑤先算除法,再算乘法;
⑥先算小括号里面的减法,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:拾荒鲤
- 2021-04-04 11:48
就是这个解释
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