{4Y=3X+4,5Y=4X+3 怎么解 二元一次方程

5x+4y=22 4x+y=3y+x 怎么解 3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y怎么解 二元一次方程(x+y)/2+(x-y)/3=6,4(x+y)-5(x-y)=2怎么算 （5x+3y)(3y-5x)-(4x-y)(4y+x)= 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 4x 5x 3y=156怎么解? 先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5 x^2-4xy+3y^2=（x-3y)(x-y)x^2-4xy+3y^2 怎么分解成（x-3y)(x-y) 7-x+3y=3y+4+5 7-x+3y=7-3x+5怎么解 三元一次方程组x-2y=5,4x-y+3z,2x+y=0怎么解 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 这题怎么解?X-Y=4,2X+Y=20,X=?Y=?3X+2Y=14,2X-3Y=5,X=?Y=?写出具体算式 x^2+2y^2-2x+y-3=0与2x^2+5y^2-4x+y-6=0 的方程组怎么解 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 请问算到4x/y=3y/x后怎么算出x,y, ｛x/60+y/80=10,x/60+y/40=15、｛2x/3+3y/4=1/5,5x/6-5y/2=2、｛5/2(x+y）=1200,10/3（x+y）=1200｛4x+5y=98,5y-4x=2、｛x/3+y/4=54/60,y/4+x/5=42/60怎么解?{40-y=x-4 40-y=y-x