高校问答童姥 丁春秋:数学问题（急！！）
来源：百度文库 编辑：高校问答 时间：2024/04/28 17:49:14
1.(1)x²y²-2xy+1;
(2)9-12t+4t²;
(3)y²+y+1/4;
(4)25m²-80m+64;
(5)x²/4+xy+y²;
(6)a²b²-4ab+4;
2.(1)(x+y)²+6(x+y)+9;
(2)a²-2a(b+c)+(b+c)²;
(3)4xy²-4x²y-y³;
(4)-a+2a²-a³;
要过程，详细一点！
(2)9-12t+4t²;
(3)y²+y+1/4;
(4)25m²-80m+64;
(5)x²/4+xy+y²;
(6)a²b²-4ab+4;
2.(1)(x+y)²+6(x+y)+9;
(2)a²-2a(b+c)+(b+c)²;
(3)4xy²-4x²y-y³;
(4)-a+2a²-a³;
要过程，详细一点！
1.
(1)x²y²-2xy+1=(xy-1)^2
(2)9-12t+4t²=(3-2t)^2
(3)y²+y+1/4=(y+1/2)^2
(4)25m²-80m+64=(5m-8)^2
(5)x²/4+xy+y²=(x/2+y)^2
(6)a²b²-4ab+4=(ab-2)^2
2.
(1)(x+y)²+6(x+y)+9=(x+y+3)^2
(2)a²-2a(b+c)+(b+c)²=(a-b-c)^2
(3)4xy²-4x²y-y³=-y(2x-y)^2
(4)-a+2a²-a³=-a(a-1)^2
1.(xy-1)^2
2.(2t-3)^2
3.(y=1/2)^2
4.(5m-8)^2
5.(ab-2)^2
1.=(x+y+3)^2
2.=(a-b-c)^2
3.=y(2x-y)^2
4.=-a(a-1)^2