①y=x²+2x-3 X∈(0,1)②y=x²+2x-3 X∈(2,3)③y=x²+2x-3 X∈(-2,0)④y=2/x 1<x≤2⑤y=3/x-1 X>1⑥y=3/x-1 +1 X>1⑦y=-(x-3)*丨x丨
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![①y=x²+2x-3 X∈(0,1)②y=x²+2x-3 X∈(2,3)③y=x²+2x-3 X∈(-2,0)④y=2/x 1<x≤2⑤y=3/x-1 X>1⑥y=3/x-1 +1 X>1⑦y=-(x-3)*丨x丨](/uploads/image/z/12203304-24-4.jpg?t=%E2%91%A0y%3Dx%26%23178%3B%2B2x-3+X%E2%88%88%EF%BC%880%2C1%EF%BC%89%E2%91%A1y%3Dx%26%23178%3B%2B2x-3+X%E2%88%88%EF%BC%882%2C3%EF%BC%89%E2%91%A2y%3Dx%26%23178%3B%2B2x-3+X%E2%88%88%EF%BC%88-2%2C0%EF%BC%89%E2%91%A3y%3D2%2Fx+1%EF%BC%9Cx%E2%89%A42%E2%91%A4y%3D3%2Fx-1+X%EF%BC%9E1%E2%91%A5y%3D3%2Fx-1+%2B1+X%EF%BC%9E1%E2%91%A6y%3D-%EF%BC%88x-3%EF%BC%89%2A%E4%B8%A8x%E4%B8%A8)
①y=x²+2x-3 X∈(0,1)②y=x²+2x-3 X∈(2,3)③y=x²+2x-3 X∈(-2,0)④y=2/x 1<x≤2⑤y=3/x-1 X>1⑥y=3/x-1 +1 X>1⑦y=-(x-3)*丨x丨
①y=x²+2x-3 X∈(0,1)
②y=x²+2x-3 X∈(2,3)
③y=x²+2x-3 X∈(-2,0)
④y=2/x 1<x≤2
⑤y=3/x-1 X>1
⑥y=3/x-1 +1 X>1
⑦y=-(x-3)*丨x丨
①y=x²+2x-3 X∈(0,1)②y=x²+2x-3 X∈(2,3)③y=x²+2x-3 X∈(-2,0)④y=2/x 1<x≤2⑤y=3/x-1 X>1⑥y=3/x-1 +1 X>1⑦y=-(x-3)*丨x丨
①(-3,0)
②(5,12)
③[-4,-3)
④[1,2)
⑤(0,+∞)
⑥(1,+∞)
⑦ R