求值,2(x一y)2十3(x+y)2一2x+2y,x一y二3
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解决时间 2021-12-02 16:47
- 提问者网友：斑駁影
- 2021-12-01 22:18
求值,2(x一y)2十3(x+y)2一2x+2y,x一y二3
最佳答案
- 五星知识达人网友：污到你湿
- 2021-12-01 22:28
x-y=3则y=x-3
2(x一y)^2十3(x+y)^2一2x+2y
=2(x-y)²+3(x+y)²-2(x-y)
=2(3)²+3(x+y)²-2(3)
=2*9+3(x+y)²-6
=18+3(x+y)²-6
=12+3(x+y)²
=12+3(x+x-3)²
=12+3(2x-3)²
=3(2x-3)²+12
2(x一y)^2十3(x+y)^2一2x+2y
=2(x-y)²+3(x+y)²-2(x-y)
=2(3)²+3(x+y)²-2(3)
=2*9+3(x+y)²-6
=18+3(x+y)²-6
=12+3(x+y)²
=12+3(x+x-3)²
=12+3(2x-3)²
=3(2x-3)²+12
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