若2^x=7,2^y=6,则4^x+y=

刚才打错了
4的x+y次

分解因式：x^2-y^2-x+y 5(x-y)^3+10(y-x)^2 x^2-6x-7 已知x^2+y^2-4x+6y+13=0,求x+y的直 3(x+y)(x-y)+4(x-y)^2=? 已知4x-3y+6z=0 x+2y-7z=0 则x-y+z/x+y-z=？ 若2X+3Y-1=Y-X-8=X+6，则2X-Y= 已知2x-y=4,则7-6x+3y=? 若x^2+6x+9+/y-1/=0,则x+y= 初二数学：若(x+y)(x-y)^2-xy(x+y)=A(x+y),则A=什么 若实数x,y满足(x+y)(x+y-3)+2=0,则x+y=多少 若 x/3y = y/2x-5y =6x-15y/x 已知x与y互为相反数，且x+y+6=2x-y，则x-y=