
已知x²+x-1=0求x[1-(2)/(1-x)]除以(x+1)-[x(x²-1)]/[x²-2x+1]的值
2个回答
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x²+x-1=0
-x²=x-1
原式=x(1-x-2)/(1-x)÷(x+1)-x(x+1)(x-1)/(x-1)²
=x(x+1)/(x-1)÷(x+1)-x(x+1)/(x-1)
=x/(x-1)-x(x+1)/(x-1)
=(x-x²-x)/(x-1)
=-x²/(x-1)
=(x-1)/(x-1)
=1
-x²=x-1
原式=x(1-x-2)/(1-x)÷(x+1)-x(x+1)(x-1)/(x-1)²
=x(x+1)/(x-1)÷(x+1)-x(x+1)/(x-1)
=x/(x-1)-x(x+1)/(x-1)
=(x-x²-x)/(x-1)
=-x²/(x-1)
=(x-1)/(x-1)
=1
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