1/x(x+1)+1/(x+1)(x+2)+…+1/(x+4)(x+5) 求 ①(x-1/y)÷(y-1/x) ②约分 4(x的平方+4x+4)/6(x的平方-4)
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![1/x(x+1)+1/(x+1)(x+2)+…+1/(x+4)(x+5) 求 ①(x-1/y)÷(y-1/x) ②约分 4(x的平方+4x+4)/6(x的平方-4)](/uploads/image/z/7113389-5-9.jpg?t=1%2Fx%28x%2B1%29%2B1%2F%28x%2B1%29%28x%2B2%29%2B%E2%80%A6%2B1%2F%EF%BC%88x%2B4%29%28x%2B5%29+%E6%B1%82+%E2%91%A0%EF%BC%88x-1%2Fy%29%C3%B7%EF%BC%88y-1%2Fx%29+%E2%91%A1%E7%BA%A6%E5%88%86+4%EF%BC%88x%E7%9A%84%E5%B9%B3%E6%96%B9%EF%BC%8B4x%2B4%29%2F6%28x%E7%9A%84%E5%B9%B3%E6%96%B9%EF%BC%8D4%EF%BC%89)
1/x(x+1)+1/(x+1)(x+2)+…+1/(x+4)(x+5) 求 ①(x-1/y)÷(y-1/x) ②约分 4(x的平方+4x+4)/6(x的平方-4)
1/x(x+1)+1/(x+1)(x+2)+…+1/(x+4)(x+5) 求 ①(x-1/y)÷(y-1/x) ②约分 4(x的平方+4x+4)/6(x的平方-4)
1/x(x+1)+1/(x+1)(x+2)+…+1/(x+4)(x+5) 求 ①(x-1/y)÷(y-1/x) ②约分 4(x的平方+4x+4)/6(x的平方-4)
①(x-1/y)÷(y-1/x)
=(xy-1)/y÷(xy-1)/x
=x/y
②约分 4(x的平方+4x+4)/6(x的平方-4)
x^2+4x+4=(x+2)^2
x^2-4=(x-2)(x+2)
可得 2(x+2)/3(x-2)=(2x+4)/(3x-6)
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分解因式----(X*X-X)(X*X-X-2)+1
】x(x+1)+x^2(x-1)
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