sos!分式的加减(1) 1/m2-4 + 1/m+2 + 1/2-m(2) x2-y2/x+y ÷ (2 - x2+y2/xy)(3) ( x/x-2 - x/x+2 ) ÷ 4x/2-x (4) a2+a/a-1 ÷ (a- a/a-1 )(5) x/x2-1 .x2+2x+1/(x-2)(x+1) ÷ 2x/x-1(6) 1/m-3 - 1/m2-9 ÷ m-1/6+2m(7)x-3/x2-1 ÷ x2-2x-3/x2+2x+1 + 1/x-1

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