来自刘绍忠的问题
3a(2a平方-4a+3)-2a平方(3a+4).其中a=-12.(2x+y-3)(2x-y+3=3.(a+3)(a-3)-(2a-1)(a+4+4.(2x-3)(x-2)-2(x-1)平方5.(y+2)平方-(y+2)(y-2)=-2(y-1)
3a(2a平方-4a+3)-2a平方(3a+4).其中a=-1
2.(2x+y-3)(2x-y+3=3.(a+3)(a-3)-(2a-1)(a+4+4.(2x-3)(x-2)-2(x-1)平方5.(y+2)平方-(y+2)(y-2)=-2(y-1)
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2020-04-09 02:49