① X/35=Y+0.6 ② X/50=Y-4/3
① X/35=Y+0.6 ② X/50=Y-4/3
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
求下列函数值域①y=√x+1 ②y=2x+1/x-3 ③ y=x²-1/x²+1 ④ y=√(5+4
求下列函数值域①y=√x+1 ②y=2x+1/x-3 ③ y=x²-1/x²+1 ④ y=√(5+4
① X/45=Y+0.5 ② X/50=Y-0.5
x²+y²-4x+6y+13=0,求(3x+y)²-3(3x+y)(x+y)-(x-3y)
已知2x-y/x+3y=2,求代数式﹙4x-2y/x+3y﹚-﹙4x+12y/2x-y﹚的值
1.用代入法解下列方程组 (1) ①x-y=3,②3x-8y=14; (2) ①2x+3y=16,②x+4y=13.
4X-3y=15.3X+2y=7.求X与y
已知x和y满足x+3y+|3x-y|=19,2x+y=6,求x,y的值
先化简,再求值:【(X+2Y)(X-2Y)-(X+4Y)平方]除4Y,其中X=-2,Y=-3
解方程组2x+y=6,4x-3y=2