9x+9y=100 10x+10y=132
X+Y=7(100X+Y)-(10Y+X)=(10Y+X)-(10X+Y)
解方程组:2/(x+y)+5/(x-y)=18 9/(x+y)-10/(y-x)=66
解方程组:2/(x+y)+5/(x-y)=18 9/(x+y)-10/(y-x)=66
解方程组 2x+y(y-2x)=9 (x+y)(x+y-3)=10
x²-2x+y²+6y+10=0,求—9(x+y)²+(3x-2y)(2y+3x)的值
已知四位数2x9y=2^x*2^y,(2^x9^y表示2*1000+x*100+9*10+y)试确定2^x9^y-x(x
二元一次方程:{3X=2Y,3X+4Y=36 {3X+4Y=10,4X+Y=9 {2X-Y=6,X+2Y=-2 {X+Y
若Y/X=9/10,求(1-Y/X)9*(X/X-Y)10的值
若Y/X=9/10,求(1-Y/X)九次方*(X/X-Y)十次方的值
已知4x+y-4x-6y+10=0,求(三分之二x√9x+y√y分之x)-x√x分之1-5x√x分之y)的值
{4/(x+y)+6/(x-y)=3 {9/(x-y)-1/(x+y)=1
已知/x/+x+y=10,/y/+x-y=12.求x+y的值