1.已知A=3a²+2b²,B=a²-2a-b²,求当(b+4)²+a-3的绝对值=0时 A-B的值2.已知3x²-x=1,求7-9x²+3x的值.3.已知x²+xy=3,xy+y²=-2 求2x²-xy-3y²的值 求是初一上册解法
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![1.已知A=3a²+2b²,B=a²-2a-b²,求当(b+4)²+a-3的绝对值=0时 A-B的值2.已知3x²-x=1,求7-9x²+3x的值.3.已知x²+xy=3,xy+y²=-2 求2x²-xy-3y²的值 求是初一上册解法](/uploads/image/z/765322-34-2.jpg?t=1.%E5%B7%B2%E7%9F%A5A%3D3a%26%23178%3B%2B2b%26%23178%3B%2CB%3Da%26%23178%3B-2a-b%26%23178%3B%2C%E6%B1%82%E5%BD%93%28b%2B4%29%26%23178%3B%2Ba-3%E7%9A%84%E7%BB%9D%E5%AF%B9%E5%80%BC%3D0%E6%97%B6+A-B%E7%9A%84%E5%80%BC2.%E5%B7%B2%E7%9F%A53x%26%23178%3B-x%3D1%2C%E6%B1%827-9x%26%23178%3B%2B3x%E7%9A%84%E5%80%BC.3.%E5%B7%B2%E7%9F%A5x%26%23178%3B%2Bxy%3D3%2Cxy%2By%26%23178%3B%3D-2+%E6%B1%822x%26%23178%3B-xy-3y%26%23178%3B%E7%9A%84%E5%80%BC+%E6%B1%82%E6%98%AF%E5%88%9D%E4%B8%80%E4%B8%8A%E5%86%8C%E8%A7%A3%E6%B3%95)
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1.已知A=3a²+2b²,B=a²-2a-b²,求当(b+4)²+a-3的绝对值=0时 A-B的值2.已知3x²-x=1,求7-9x²+3x的值.3.已知x²+xy=3,xy+y²=-2 求2x²-xy-3y²的值 求是初一上册解法
1.已知A=3a²+2b²,B=a²-2a-b²,求当(b+4)²+a-3的绝对值=0时 A-B的值
2.已知3x²-x=1,求7-9x²+3x的值.3.已知x²+xy=3,xy+y²=-2 求2x²-xy-3y²的值 求是初一上册解法
1.已知A=3a²+2b²,B=a²-2a-b²,求当(b+4)²+a-3的绝对值=0时 A-B的值2.已知3x²-x=1,求7-9x²+3x的值.3.已知x²+xy=3,xy+y²=-2 求2x²-xy-3y²的值 求是初一上册解法