1.长方形的长为4a-3b,宽比长短a-b,那么这个长方形的周长是多少2.已知A=-x³+2x²-3x-1,B=-2+x+x²(1)A+B(2)2(A-B)(3) 2A-[B-(B-A)]3.多项式f(x)的2倍减去多项式2x^n+3-9x^n+2+5x^n+1-2x^n的差为多项
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![1.长方形的长为4a-3b,宽比长短a-b,那么这个长方形的周长是多少2.已知A=-x³+2x²-3x-1,B=-2+x+x²(1)A+B(2)2(A-B)(3) 2A-[B-(B-A)]3.多项式f(x)的2倍减去多项式2x^n+3-9x^n+2+5x^n+1-2x^n的差为多项](/uploads/image/z/9487361-65-1.jpg?t=1.%E9%95%BF%E6%96%B9%E5%BD%A2%E7%9A%84%E9%95%BF%E4%B8%BA4a-3b%2C%E5%AE%BD%E6%AF%94%E9%95%BF%E7%9F%ADa-b%2C%E9%82%A3%E4%B9%88%E8%BF%99%E4%B8%AA%E9%95%BF%E6%96%B9%E5%BD%A2%E7%9A%84%E5%91%A8%E9%95%BF%E6%98%AF%E5%A4%9A%E5%B0%912.%E5%B7%B2%E7%9F%A5A%3D-x%26sup3%3B%2B2x%26sup2%3B-3x-1%2CB%3D-2%2Bx%2Bx%26sup2%3B%EF%BC%881%EF%BC%89A%2BB%EF%BC%882%EF%BC%892%EF%BC%88A-B%29%283%29+2A-%5BB-%28B-A%29%5D3.%E5%A4%9A%E9%A1%B9%E5%BC%8Ff%EF%BC%88x%29%E7%9A%842%E5%80%8D%E5%87%8F%E5%8E%BB%E5%A4%9A%E9%A1%B9%E5%BC%8F2x%5En%2B3-9x%5En%2B2%2B5x%5En%2B1-2x%5En%E7%9A%84%E5%B7%AE%E4%B8%BA%E5%A4%9A%E9%A1%B9)
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