(1)2x/9-x² + 1/x-3 + 2/x²+6x+9(2)1/x²-3x+2 + 1/x²-5x+6 + 1/x²-4x+3(3)1/1-x + 1/1+x + 2/1+x² + 4/1+x²(4)先化简,再求2(a+b)/a-b + 3b/2a+2b + ab+7b²/2a²-2b²的值,其中a=49/4,b=-31/4
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![(1)2x/9-x² + 1/x-3 + 2/x²+6x+9(2)1/x²-3x+2 + 1/x²-5x+6 + 1/x²-4x+3(3)1/1-x + 1/1+x + 2/1+x² + 4/1+x²(4)先化简,再求2(a+b)/a-b + 3b/2a+2b + ab+7b²/2a²-2b²的值,其中a=49/4,b=-31/4](/uploads/image/z/8889683-59-3.jpg?t=%EF%BC%881%EF%BC%892x%2F9-x%26sup2%3B+%2B+1%2Fx-3+%2B+2%2Fx%26sup2%3B%2B6x%2B9%EF%BC%882%EF%BC%891%2Fx%26sup2%3B-3x%2B2+%2B+1%2Fx%26sup2%3B-5x%2B6+%2B+1%2Fx%26sup2%3B-4x%2B3%EF%BC%883%EF%BC%891%2F1-x+%2B+1%2F1%2Bx+%2B+2%2F1%2Bx%26sup2%3B+%2B+4%2F1%2Bx%26sup2%3B%EF%BC%884%EF%BC%89%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%822%28a%2Bb%29%2Fa-b+%2B+3b%2F2a%2B2b+%2B+ab%2B7b%26sup2%3B%2F2a%26sup2%3B-2b%26sup2%3B%E7%9A%84%E5%80%BC%2C%E5%85%B6%E4%B8%ADa%3D49%2F4%2Cb%3D-31%2F4)
(1)2x/9-x² + 1/x-3 + 2/x²+6x+9(2)1/x²-3x+2 + 1/x²-5x+6 + 1/x²-4x+3(3)1/1-x + 1/1+x + 2/1+x² + 4/1+x²(4)先化简,再求2(a+b)/a-b + 3b/2a+2b + ab+7b²/2a²-2b²的值,其中a=49/4,b=-31/4
(1)2x/9-x² + 1/x-3 + 2/x²+6x+9
(2)1/x²-3x+2 + 1/x²-5x+6 + 1/x²-4x+3
(3)1/1-x + 1/1+x + 2/1+x² + 4/1+x²
(4)先化简,再求2(a+b)/a-b + 3b/2a+2b + ab+7b²/2a²-2b²的值,其中a=49/4,b=-31/4
(1)2x/9-x² + 1/x-3 + 2/x²+6x+9(2)1/x²-3x+2 + 1/x²-5x+6 + 1/x²-4x+3(3)1/1-x + 1/1+x + 2/1+x² + 4/1+x²(4)先化简,再求2(a+b)/a-b + 3b/2a+2b + ab+7b²/2a²-2b²的值,其中a=49/4,b=-31/4
1.-2X(X+3)+(X+3)^2+2(X-3)/(X+3)^2 (X-3)=X+1/(X+3)^2=X+1/X^2+6X+9
2.X-3+X-1+X-2/(X-3)(X-2)(X-1)=3/(X-2)(X-1)=3/X^2-3X+2
3.X+1+X-1/(1+X)(1-X+) +2/1+x² + 4/1+x²=2X(1+X^2)+6(1-X^2)/(1+X^2)(1-X^2)=2X^3-6X^2+2X+6/1-4X^4
4.4(a+b)^2+3b(a-b)+ab+7b^2/2(a+b)(a-b)=2*(49/4)^2+49/4*(-31/4)+3(-31/4)^2/180=2083/8