Y=1/2X*2-6X+21等于I/2（X-6）*2+3的过程

Y=1/2X*2-6X+21等于I/2（X-6）*2+3的过程 已知Ix+y+1I+(x-y+3)^2=0,则(x+y)^2004等于 若x,y∈R,(x+y)^2i+6i-x=-y+5(x+y)i-1,求x和y的值 若(x-3i)i=3y+2i,x,y属于R,则x-yi等于 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 设x.y属于R,且x/（1+i）+y/（1+2i）=5/（1+3i）则x、y等于 设x大于1,y大于0,x^y+x^-y=2根号二,x^y-x^-y等于? 设全集I={(x,y)|x,y∈R}集合M={（x,y)|y-3/x-2=1},N={(x,y)|y≠x+1},则Ci(M∪N）等于? 若实数x,y满足x+y+(x-y)i=2,则xy的值等于 已知2x-1+(y+1)i=x-y+(-x-y)i,求实数x,y的值 x^2+6x+y^2+4x+10=0,则x+y等于多少? x-y+1大于等于0,x+y-2大于等于0,x小于等于1,求z=（x+2y)/(2x+y)的范围 {6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1 1/2X-1/X+Y*(X+Y/2X-X-Y)等于多少, 2x-5y=21,y=-x x、y等于多少 若x^2+y^2+2x+10=6y,则y^x等于? 已知x+y=6,x-y=5,则x^2-y^2等于多少 如果|x-2y+1|+|2x-y-5|=0 .x+y等于几