合并同类项和去括号和化简1.去括号-(2x²-3x-1) 2.化简-(a²-2ab)+【a²-(ab+2)】3.合并同类项5xy²+3x²y-xy²-2x²y-1
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合并同类项和去括号和化简1.去括号-(2x²-3x-1)2.化简-(a²-2ab)+【a²-(ab+2)】3.合并同类项5xy²+3x²y-xy&su
合并同类项和去括号和化简1.去括号-(2x²-3x-1) 2.化简-(a²-2ab)+【a²-(ab+2)】3.合并同类项5xy²+3x²y-xy²-2x²y-1
合并同类项和去括号和化简
1.去括号
-(2x²-3x-1)
2.化简
-(a²-2ab)+【a²-(ab+2)】
3.合并同类项
5xy²+3x²y-xy²-2x²y-1
合并同类项和去括号和化简1.去括号-(2x²-3x-1) 2.化简-(a²-2ab)+【a²-(ab+2)】3.合并同类项5xy²+3x²y-xy²-2x²y-1
1.-2x²+3x+1
2.ab+2
3.(4y+x)xy-1
自己想 让我来说 没门
1.-2x²+3x+1
2.-a²+2ab+(a²-ab-2)
=-a²+2ab+a²-ab-2
=ab-2
3.4xy²+x²y-1
=xy(4y+x)-1