68-4.4X=24 8y-4×14=0 x+3.5×3=18

解方程组24/(x+y) +24/(x-y) = 7/3 ,8/(x+y) +18/(x-y) = 4/3 9y=3x-(x-1),4(x+y)-(2x+4)=8y 设x,y满足约束条件x>=0 y>=x 4x+3y 解方程 2x+3y=21 5x+4y=59 12x+5y=99 2x+3y=18 2x+3y=24 8x+5y=51 5 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组, 已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值 22.x+6y=14 3x+3y=27 23.7x+4y=67 2x+8y=26 24 x(y+2)+(4-x)=9与x(y+3)+y(8-x)=14解方程式 已知实数x,y满足x^2+y^2-6x-8y+24=0,则3x+4y-10的取值范围是 已知x的平方+y的平方-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y) 已知x²+y²-8x+6y+25=0,求（x-y+4xy/x-y）（x+y-4xy/x+y）