7x-4y=3 y+7x=8怎么算
7x-4y=3 y+7x=8怎么算
已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y
7x-3y=-1 4x-5y=-17方程组怎么算? 7x-3y=-1怎么变形?y=?
解方程组24/(x+y) +24/(x-y) = 7/3 ,8/(x+y) +18/(x-y) = 4/3
{5x+4y=7 {7x+3y=15 怎么算
3x+2=y 5X+4=Y 7X+6=Y 9X+8=y 11x=y要如何计算
3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y
y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,
3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y 联立方程 有的话
2X+Y+Z=10,X+2Y+Z=-6,X+Y+2Z=8 5X+4Y-3Y=13,2X-3Y+7Z=19,3X-Y=2X
(3x-4y)(5x-4y)-(7x-8y)(6y-5x)
2x-y=8 3x+2y=5与3x+2y=1 3x-4y=-11用加减法怎么算?