作业帮先化简,再求值一.(4A+3A²-3)-(-A+4A²)+A²,其中A=-2二.（2X²Y-2XY²）-[(-3X²Y²+3X²Y)+（3X²Y²-3XY²)],其中X=-1,Y=2
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![先化简,再求值一.(4A+3A²-3)-(-A+4A²)+A²,其中A=-2二.（2X²Y-2XY²）-[(-3X²Y²+3X²Y)+（3X²Y²-3XY²)],其中X=-1,Y=2](/uploads/image/z/445260-12-0.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%E4%B8%80.%284A%2B3A%26%23178%3B-3%29-%28-A%2B4A%26%23178%3B%29%2BA%26%23178%3B%2C%E5%85%B6%E4%B8%ADA%3D-2%E4%BA%8C.%EF%BC%882X%26%23178%3BY-2XY%26%23178%3B%EF%BC%89-%5B%28-3X%26%23178%3BY%26%23178%3B%2B3X%26%23178%3BY%29%2B%EF%BC%883X%26%23178%3BY%26%23178%3B-3XY%26%23178%3B%29%5D%2C%E5%85%B6%E4%B8%ADX%3D-1%2CY%3D2)
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先化简,再求值一.(4A+3A²-3)-(-A+4A²)+A²,其中A=-2二.（2X²Y-2XY²）-[(-3X²Y²+3X²Y)+（3X²Y²-3XY²)],其中X=-1,Y=2
先化简,再求值一.(4A+3A²-3)-(-A+4A²)+A²,其中A=-2
二.（2X²Y-2XY²）-[(-3X²Y²+3X²Y)+（3X²Y²-3XY²)],其中X=-1,Y=2
先化简,再求值一.(4A+3A²-3)-(-A+4A²)+A²,其中A=-2二.（2X²Y-2XY²）-[(-3X²Y²+3X²Y)+（3X²Y²-3XY²)],其中X=-1,Y=2
一.=4A+3A²-3+A-4A²+A²=5A-3 A=-2 所以=-13
二.=2x²y-2xy²+3x²y²-3x²y-3x²y²+3xy²
=-x²y+xy²
所以原式=-(-1)²×2+(-1)×2²
=-2-4
=-6