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一元一次方程去括弧的話:外面如果是正號,可以直接去掉 外面如果是負號的話,則外面負號去掉,括弧裡面的都要變號,正號變負號,負號變正號
分成兩個不等式 x-7+2-3 x>-3/2 3x-2
嗯.遇負數變號.
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