解不等式3x-7/x²+2x-3≥2
2个回答
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3x-7/x²+2x-3≥2
(3x-7)/(x²+2x-3)-2≥0
(-2X²-X-1)/(X²+2X-3)≥0
(2X²+X+1)/(X²+2X-3)≤0
(X²+X/2+1/16+7/16)/(X²+2X-3)≤0
[(X+1/2)²+7/16]/(X²+2X-3)≤0
∵(X+1/2)²+7/16﹥0
∴X²+2X-3﹤0
(X+3)(x-1)﹤0
即-3<x<1
(3x-7)/(x²+2x-3)-2≥0
(-2X²-X-1)/(X²+2X-3)≥0
(2X²+X+1)/(X²+2X-3)≤0
(X²+X/2+1/16+7/16)/(X²+2X-3)≤0
[(X+1/2)²+7/16]/(X²+2X-3)≤0
∵(X+1/2)²+7/16﹥0
∴X²+2X-3﹤0
(X+3)(x-1)﹤0
即-3<x<1
追问
(3x-7)/(x²+2x-3)-2≥0
(-2X²-X-1)/(X²+2X-3)≥0
怎么来的
追答
(3x-7)/(x²+2x-3)-2(x²+2x-3)/(x²+2x-3)≥o
(3x-7-2x²-4x+6)/(x²+2x-3)≥0
(-2X²-X-1)/(X²+2X-3)≥0
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