①(x-2分之x-x+2分之x)*(x分之2-x) =[x/(x-2)-x/(x+2)]*[-(x-2)/x] =-1+(x-2)/(x+2) =(-x-2+x-2)/(x+2) =-4/(x+2) ②(x-2分之x-x+2分之x)*(x分之2-x) =[x/(x-2)--x/(x+2)]*(x/(2-x) =[(x²+2x-x²+2x)/(x-2)(x+2)*[-(x-2)/x] =[4x/(x+2)(x-2)]*[-(x-2)/x] =-4/(x+2)