2x+5/x-1 - 1-x/4x+10=9/4(是分数减分数)
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原式可化为
2x+20x/4x(x-1)-(1-x)(x-1)/4x(x-1)=9/4
2x+20x/4x²-4x-(x-1-x²+1)/4x²-4x=9/4
-2x+(20x-x+1+x²-1)/4x²=9/4
-2x+(x²+19x)/4x²=9/4
-2x+1/4+19/4x=9/4
-8x²+19/4x=8/4
-8x²+19=2×4x
-8x²+19=8x
-8x²-8x+19=0
8x²+8x-19=0
△=b²-4ac=64-4×8×(-19)=672
x=(-8)±√672/16
解得x1=4√42-8/16 x2=-(4√42+8)/16
2x+20x/4x(x-1)-(1-x)(x-1)/4x(x-1)=9/4
2x+20x/4x²-4x-(x-1-x²+1)/4x²-4x=9/4
-2x+(20x-x+1+x²-1)/4x²=9/4
-2x+(x²+19x)/4x²=9/4
-2x+1/4+19/4x=9/4
-8x²+19/4x=8/4
-8x²+19=2×4x
-8x²+19=8x
-8x²-8x+19=0
8x²+8x-19=0
△=b²-4ac=64-4×8×(-19)=672
x=(-8)±√672/16
解得x1=4√42-8/16 x2=-(4√42+8)/16
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