是带有负号的括号去计算)3a^2-2b+b^2-2a^2+5b -4xy-3x-7yx+2x-6y
1个回答
3a^2-2b+b^2-2a^2+5b =a^+b^2+3b
-4xy-3x-7yx+2x-6y=-11xy-x-6y
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