化简:①-1/2x-(x-3)②-1/2(4x-6)+1/3(6-3x)③-(x²-2x-2)+2(x²-1)④2n-(2-n)+(6n-2)化简并求值:(a²b-ab)-2(ab²-ba),其中a=-1/2,b=2
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![化简:①-1/2x-(x-3)②-1/2(4x-6)+1/3(6-3x)③-(x²-2x-2)+2(x²-1)④2n-(2-n)+(6n-2)化简并求值:(a²b-ab)-2(ab²-ba),其中a=-1/2,b=2](/uploads/image/z/13566749-5-9.jpg?t=%E5%8C%96%E7%AE%80%EF%BC%9A%E2%91%A0-1%2F2x-%EF%BC%88x-3%29%E2%91%A1-1%2F2%284x-6%29%2B1%2F3%286-3x%29%E2%91%A2-%EF%BC%88x%26%23178%3B-2x-2%29%2B2%28x%26%23178%3B-1%EF%BC%89%E2%91%A32n-%282-n%29%2B%286n-2%29%E5%8C%96%E7%AE%80%E5%B9%B6%E6%B1%82%E5%80%BC%EF%BC%9A%EF%BC%88a%26%23178%3Bb-ab%29-2%28ab%26%23178%3B-ba%29%2C%E5%85%B6%E4%B8%ADa%3D-1%2F2%2Cb%3D2)
化简:①-1/2x-(x-3)②-1/2(4x-6)+1/3(6-3x)③-(x²-2x-2)+2(x²-1)④2n-(2-n)+(6n-2)化简并求值:(a²b-ab)-2(ab²-ba),其中a=-1/2,b=2
化简:①-1/2x-(x-3)②-1/2(4x-6)+1/3(6-3x)③-(x²-2x-2)+2(x²-1)④2n-(2-n)+(6n-2)
化简并求值:(a²b-ab)-2(ab²-ba),其中a=-1/2,b=2
化简:①-1/2x-(x-3)②-1/2(4x-6)+1/3(6-3x)③-(x²-2x-2)+2(x²-1)④2n-(2-n)+(6n-2)化简并求值:(a²b-ab)-2(ab²-ba),其中a=-1/2,b=2
原式=ab(1+a-2b)=7/2