算式中先算加减还是先算乘除 算式中先算加减还是先算乘除?
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\u8fd0\u7b97\u987a\u5e8f\u5982\u4e0b\uff1a
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2\u3001\u4e24\u7ea7\u8fd0\u7b97\u65f6\uff0c\u5148\u7b97\u4e58\u9664\uff0c\u540e\u7b97\u52a0\u51cf\u3002
3\u3001\u6709\u62ec\u53f7\u65f6\uff0c\u5148\u7b97\u62ec\u53f7\u91cc\u9762\u7684\uff0c\u518d\u7b97\u62ec\u53f7\u5916\u9762\u7684\uff1b
4\u3001\u6709\u591a\u5c42\u62ec\u53f7\u65f6\uff0c\u5148\u7b97\u5c0f\u62ec\u53f7\u91cc\u7684\uff0c\u518d\u7b97\u4e2d\u62ec\u53f7\u91cc\u9762\u7684\uff0c\u518d\u7b97\u5927\u62ec\u53f7\u91cc\u9762\u7684\uff0c\u6700\u540e\u7b97\u62ec\u53f7\u5916\u9762\u7684\u3002
5\u3001\u8981\u662f\u6709\u4e58\u65b9\uff0c\u6700\u5148\u7b97\u4e58\u65b9\u3002
6\u3001\u5728\u6df7\u5408\u8fd0\u7b97\u4e2d\uff0c\u5148\u7b97\u62ec\u53f7\u5185\u7684\u6570 \uff0c\u62ec\u53f7\u4ece\u5c0f\u5230\u5927\uff0c\u5982\u6709\u4e58\u65b9\u5148\u7b97\u4e58\u65b9\uff0c\u7136\u540e\u4ece\u9ad8\u7ea7\u5230\u4f4e\u7ea7\u3002
\u8131\u5f0f\u8ba1\u7b97
\u8131\u5f0f\u8ba1\u7b97\u5373\u9012\u7b49\u5f0f\u8ba1\u7b97\uff0c\u628a\u8ba1\u7b97\u8fc7\u7a0b\u5b8c\u6574\u5199\u51fa\u6765\u7684\u8fd0\u7b97\uff0c\u4e5f\u5c31\u662f\u8131\u79bb\u7ad6\u5f0f\u7684\u8ba1\u7b97\u3002\u5728\u8ba1\u7b97\u6df7\u5408\u8fd0\u7b97\u65f6\uff0c\u901a\u5e38\u662f\u4e00\u6b65\u8ba1\u7b97\u4e00\u4e2a\u7b97\u5f0f(\u9010\u6b65\u8ba1\u7b97\uff0c\u7b49\u53f7\u4e0d\u80fd\u5199\u5728\u539f\u5f0f\u4e0a\uff09\uff0c\u8981\u5199\u51fa\u6bcf\u4e00\u6b65\u7684\u8fc7\u7a0b\u3002\u4e00\u822c\u6765\u8bf4\uff0c\u7b49\u53f7\u8981\u5f80\u524d\uff0c\u4e0d\u4e0e\u7b2c\u4e00\u884c\u5bf9\u9f50\u3002
\u793a\u4f8b\uff1a
1+2\u00d7(4-3)/5\u00d7[(7-6)/8\u00d79]
=1+2\u00d71/5\u00d7[1/8\u00d79]
=1+2/5\u00d7[0.125\u00d79]
=1+0.4\u00d71.125
=1+0.45
=1.45
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\u6269\u5c55\u8d44\u6599\uff1a
\u4e00\u3001\u8131\u5f0f\u8ba1\u7b97
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\u793a\u4f8b\uff1a
1+2*(4-3)/5*[(7-6)/8*9]
=1+2*1/5*[1/8*9]
=1+2/5*[0.125*9]
=1+0.4*1.125
=1+0.45
=1.45
\u4e8c\u3001\u8fd0\u7b97\u6ce8\u610f\u4e8b\u9879
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2\u3001\u5982\u679c\u4e00\u7ea7\u8fd0\u7b97\u548c\u4e8c\u7ea7\u8fd0\u7b97\uff0c\u540c\u65f6\u6709\uff0c\u5148\u7b97\u4e8c\u7ea7\u8fd0\u7b97
3\u3001\u5982\u679c\u4e00\u7ea7\uff0c\u4e8c\u7ea7\uff0c\u4e09\u7ea7\u8fd0\u7b97\uff08\u5373\u4e58\u65b9\u3001\u5f00\u65b9\u548c\u5bf9\u6570\u8fd0\u7b97\uff09\u540c\u65f6\u6709\uff0c\u5148\u7b97\u4e09\u7ea7\u8fd0\u7b97\u518d\u7b97\u5176\u4ed6\u4e24\u7ea7\u3002
4\u3001\u5982\u679c\u6709\u62ec\u53f7\uff0c\u8981\u5148\u7b97\u62ec\u53f7\u91cc\u7684\u6570\uff08\u4e0d\u7ba1\u5b83\u662f\u4ec0\u4e48\u7ea7\u7684\uff0c\u90fd\u8981\u5148\u7b97\uff09\u3002
5\u3001\u5728\u62ec\u53f7\u91cc\u9762\uff0c\u4e5f\u8981\u5148\u7b97\u4e09\u7ea7\uff0c\u7136\u540e\u5230\u4e8c\u7ea7\u3001\u4e00\u7ea7\u3002
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\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1-\u56db\u5219\u8fd0\u7b97
算式中加减运算和乘除运算的顺序是:
把加减叫一级运算,把乘除叫二级运算。
只有同级运算时,从左往右依次计算。
异级运算时,先乘除后加减。
有括号时,先算小括号里的,再算中括号里的,最后算括号外的。
算式中,是先算乘除,再算加减。
算式四则运算
加法和减法叫做第一级运算;乘法和除法叫做第二级运算
同级运算时
也就是算式里同时只有有加减法,从左到右依次计算;
两级运算时
也就是同时有加减乘除的时候,先算乘除,后算加减。
先乘除,后加减
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