3x+(x-1)÷2=3-(2x-1)÷3 (3y-1)÷4=(5y-7)÷6
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
(2/3x-2/x+y(x+y/3x-x-y))÷x-y/x,其中5x+3y=0
y=5;x=14;y=((x=3*y,x+6),x-1); printf(''x=%d,y=%d'
先化简再求值:-3(2x-y)-{7-〔6x+2y-(10x-8y)〕+x-2(3x-4y)}已知x=-1/5,y=-5
[(2x+y)²-y(y+4x)-8x] ÷2x 其中x=2,y=-1
计算(1)x/x+y-x/x-y (2)a+2+4/a+2 (3)x^2-y^2/xy÷(x+y)
(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.
先化简,再求值∶(1/x-y-1/x+y)÷2y/x²+2xy+y²,其中x=根号下3加根号下2,y
下列式子中的y是x的函数吗?为什么?1.y=3x-5 2.y=x-2÷x-1 3
((x+2y)x^2+(x-y)(3x-y)-5y^2)÷2x
化简求值 [(x+2y)(x-2y)-(2x-y)ˆ2+(3x+y)(2x+5y)]÷(-1/2x),其中x=
数学题化简再求值(1/x-y+1/x+y)÷x^2 y^2/x^2-y^2,其中x=3,y=-√2