是先加减后乘除还是先乘除后加减 数学题上来讲，是先加减后乘除，还是先乘除后加减呢？
\u5c0f\u5b66\u7b97\u5f0f\u662f\u5148\u52a0\u51cf\u518d\u4e58\u9664\uff0c\u8fd8\u662f\u5148\u4e58\u9664\u518d\u52a0\u51cf\uff1f\u5c0f\u5b66\u7b97\u5f0f\u4e2d\uff0c\u5728\u6ca1\u6709\u62ec\u53f7\u7684\u60c5\u51b5\u4e0b\uff0c\u8fd0\u7b97\u987a\u5e8f\u4e3a\u5148\u4e58\u9664\uff0c\u518d\u52a0\u51cf\u3002
\u8fd0\u7b97\u987a\u5e8f\u5982\u4e0b\uff1a
1\u3001\u540c\u7ea7\u8fd0\u7b97\u65f6\uff0c\u4ece\u5de6\u5230\u53f3\u4f9d\u6b21\u8ba1\u7b97\uff1b
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
\u6570\u5b66\u9898\u4e0a\u6765\u8bb2\uff0c\u662f\u5148\u4e58\u9664\u540e\u52a0\u51cf\u3002
\u6df7\u5408\u8fd0\u7b97\u4e2d\uff0c\u5982\u679c\u53ea\u6709\u52a0\u548c\u51cf\u6216\u8005\u53ea\u6709\u4e58\u548c\u9664\uff0c\u4ece\u5de6\u5f80\u53f3\u8ba1\u7b97\uff0c\u4f8b\u5982\uff1a2+1-1=2\uff0c\u5148\u7b972+1\u7684\u5f97\u6570\uff0c2+1\u7684\u5f97\u6570\u518d\u51cf1\u3002
\u5982\u679c\u4e00\u7ea7\u8fd0\u7b97\u548c\u4e8c\u7ea7\u8fd0\u7b97\uff0c\u540c\u65f6\u6709\uff0c\u5148\u7b97\u4e8c\u7ea7\u8fd0\u7b97\u3002\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
\u4e58\u9664\u6cd5\u8ba1\u7b97\uff1a
\u4e24\u4e2a\u6570\u7684\u5dee\u4e0e\u4e00\u4e2a\u6570\u76f8\u4e58\uff0c\u53ef\u4ee5\u8ba9\u88ab\u51cf\u6570\u548c\u51cf\u6570\u5206\u522b\u4e0e\u8fd9\u4e2a\u6570\u76f8\u4e58\uff0c\u518d\u628a\u6240\u5f97\u7684\u79ef\u76f8\u51cf\u3002\u4f8b\u5982\uff1a (137-125)\u00d78=137\u00d78-125\u00d78=96\u3002
\u4e24\u4e2a\u6570\u7684\u5dee\u9664\u4ee5\u4e00\u4e2a\u6570\uff0c\u53ef\u4ee5\u4ece\u88ab\u51cf\u6570\u9664\u4ee5\u8fd9\u4e2a\u6570\u6240\u5f97\u7684\u5546\u91cc\uff0c\u51cf\u53bb\u51cf\u6570\u9664\u4ee5\u8fd9\u4e2a\u6570\u6240\u5f97\u7684\u5546\u3002\u4f8b\u5982\uff1a(65-39)\u00f713=65\u00f713-39\u00f713=2\u3002
先乘除后加减。
先乘除后加减
先加减后乘除
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