85 MATH2215 2x+1 dx x2-7x +12 2x+1 メー4XX-3) B. (X-4) (X-3) ACX-3)+ B(X-4) てメー4)CX-3) = Ax-3A+Bx-HB %3D (x -4)(x-3) = Ax+Bx-3A -4B %3D 3 = 2 4B=1

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