①3x²-5xy与8x²-8xy的一半的差为( ) ②已知多项式A减去-3x+5,再加上x²-x-7后,得5x²-3x-1,则A为( ) A.4x²+5x+11 B.4x²-5x-11 C.4x²-5x+11 D.4x²+5x-11③化简:-3x-[4x-(-9x+1/2)-2]=_____.
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![①3x²-5xy与8x²-8xy的一半的差为( ) ②已知多项式A减去-3x+5,再加上x²-x-7后,得5x²-3x-1,则A为( ) A.4x²+5x+11 B.4x²-5x-11 C.4x²-5x+11 D.4x²+5x-11③化简:-3x-[4x-(-9x+1/2)-2]=_____.](/uploads/image/z/3841470-54-0.jpg?t=%E2%91%A03x%26%23178%3B-5xy%E4%B8%8E8x%26%23178%3B-8xy%E7%9A%84%E4%B8%80%E5%8D%8A%E7%9A%84%E5%B7%AE%E4%B8%BA%EF%BC%88+%EF%BC%89+%E2%91%A1%E5%B7%B2%E7%9F%A5%E5%A4%9A%E9%A1%B9%E5%BC%8FA%E5%87%8F%E5%8E%BB-3x%2B5%2C%E5%86%8D%E5%8A%A0%E4%B8%8Ax%26%23178%3B-x-7%E5%90%8E%2C%E5%BE%975x%26%23178%3B-3x-1%2C%E5%88%99A%E4%B8%BA%EF%BC%88+%EF%BC%89+A.4x%26%23178%3B%2B5x%2B11+B.4x%26%23178%3B-5x-11+C.4x%26%23178%3B-5x%2B11+D.4x%26%23178%3B%2B5x-11%E2%91%A2%E5%8C%96%E7%AE%80%EF%BC%9A-3x-%5B4x-%28-9x%2B1%2F2%29-2%5D%3D_____.)
①3x²-5xy与8x²-8xy的一半的差为( ) ②已知多项式A减去-3x+5,再加上x²-x-7后,得5x²-3x-1,则A为( ) A.4x²+5x+11 B.4x²-5x-11 C.4x²-5x+11 D.4x²+5x-11③化简:-3x-[4x-(-9x+1/2)-2]=_____.
①3x²-5xy与8x²-8xy的一半的差为( ) ②已知多项式A减去-3x+5,再加上x²-x-7后,得5x²-3x-1,则A为( ) A.4x²+5x+11 B.4x²-5x-11 C.4x²-5x+11 D.4x²+5x-11
③化简:-3x-[4x-(-9x+1/2)-2]=_____.④已知A=3a²-6a+1,B=-2a²+3,C= 4a,求(B+C)-[A-(B-C)]【写过程】
①3x²-5xy与8x²-8xy的一半的差为( ) ②已知多项式A减去-3x+5,再加上x²-x-7后,得5x²-3x-1,则A为( ) A.4x²+5x+11 B.4x²-5x-11 C.4x²-5x+11 D.4x²+5x-11③化简:-3x-[4x-(-9x+1/2)-2]=_____.
1、-x^2-xy 2、C
1.-x²-xy 2.C