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