分式及其运算1.-x²-1/1-x=2.m²/m-n+ n²/n-m=3.a²+1/a-1 -a+14.当x?时,分式x²/2-3x的值为-1
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![分式及其运算1.-x²-1/1-x=2.m²/m-n+ n²/n-m=3.a²+1/a-1 -a+14.当x?时,分式x²/2-3x的值为-1](/uploads/image/z/5441228-44-8.jpg?t=%E5%88%86%E5%BC%8F%E5%8F%8A%E5%85%B6%E8%BF%90%E7%AE%971.-x%26sup2%3B-1%2F1-x%3D2.m%26sup2%3B%2Fm-n%2B+n%26sup2%3B%2Fn-m%3D3.a%26sup2%3B%2B1%2Fa-1+-a%2B14.%E5%BD%93x%3F%E6%97%B6%2C%E5%88%86%E5%BC%8Fx%26sup2%3B%2F2-3x%E7%9A%84%E5%80%BC%E4%B8%BA-1)
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分式及其运算1.-x²-1/1-x=2.m²/m-n+ n²/n-m=3.a²+1/a-1 -a+14.当x?时,分式x²/2-3x的值为-1
分式及其运算
1.-x²-1/1-x=
2.m²/m-n+ n²/n-m=
3.a²+1/a-1 -a+1
4.当x?时,分式x²/2-3x的值为-1
分式及其运算1.-x²-1/1-x=2.m²/m-n+ n²/n-m=3.a²+1/a-1 -a+14.当x?时,分式x²/2-3x的值为-1
1.-x²-1/1-x=x²+1/x+1
2.m²/m-n+ n²/n-m=m²/m-n²/m-n=(m²-n²)/m-n=(m+n)(m-n)/m-n=m+n
3.a²+1/a-1 -a+1=a²+1/a-1 -(a-1)=a²+1/a-1 -(a-1)²/a-1=(a²+1 -a²+2a-1)/a-1=2a/a-1
4.x²/2-3x =-1 两边同乘以2-3x得 x²=-2+3x x²-3x +2=0 x=2或1