3x+3y=27 (27/y)-(27/x)=1+21/60
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
(1)已知(x-1)x+2=1,求整数x的值;(2)已知3x=4,3y=6,求9x-y+27x-y的值.
y=5;x=14;y=((x=3*y,x+6),x-1); printf(''x=%d,y=%d'
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
3(x-y)²-18(x-1)+27
先化简,再求值:【(X+2Y)(X-2Y)-(X+4Y)平方]除4Y,其中X=-2,Y=-3
计算(1)3x/8y×16y²/27x² (2)(2xy-x²)÷x-2y/xy 2x-6
2^x=4^(y-1) 27^y=3^(x+1)求x-y
x+y=200 (100×1×x):(100×1.5×y)=3:4
(2/3x-2/x+y(x+y/3x-x-y))÷x-y/x,其中5x+3y=0
x²+y²-4x+6y+13=0,求(3x+y)²-3(3x+y)(x+y)-(x-3y)
(x-y分之1+x+y分之1)除 x方-y方分之x方y其中x=根号3+1,y=根号3-1