计算(2x-y+1)(2x+y-1)
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计算(2x-y+1)(2x+y-1)计算(2x-y+1)(2x+y-1)计算(2x-y+1)(2x+y-1)原式=[2x+(y-1)][2x-(y-1)]=4x²-(y-1)²=4
计算(2x-y+1)(2x+y-1)
计算(2x-y+1)(2x+y-1)
计算(2x-y+1)(2x+y-1)
原式=[2x+(y-1)][2x-(y-1)]
=4x²-(y-1)²
=4x²-y²+2y-1
看完了采纳哦~~祝学习进步!
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