2x+4y=25；5x-6y=10,那么x=?y=?

3x+2y=6 ,5x+6y=10那么x+y=? x.y是自然数,规定x@y=4x-5y,那么5@6=? x、y是自然数,规定x@y=4x-3y,那么5@6=? 已知4x=5y,那么(3x+y)/(x-2y)= (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai 5(x-y)^3*[-6/25(y-x)^3][-2/3(y-x^4]= {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20 {(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20 4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27