x/3=y/4=z/5;x-2y+3z=30 快~~~题目の答
来源:百度知道 编辑:UC知道 时间:2024/05/30 22:54:56
{x/3=y/4=z/5
{x-2y+3z=30
解得好加分哦~~~~~~~~~
{x-2y+3z=30
解得好加分哦~~~~~~~~~
x/3=y/4=z/5,则x:y:z=3:4:5
3-2×4+3×5=10
30÷10=3
x=3×3=9
y=4×3=12
z=5×3=15
根据x/3=y/4=z/5 可得,x=3z/5,y=4z/5
则 x-2y+3z=3z/5-8z/5+3z=2z=30
得 z=15
x=9, y=12
就这俩式子应该解不开三个解吧
缺了一个式子
已知3x*x-xy-4y*y=0(x#y),求x/y的值
(x+y)/3=(x-y)/4 2x+3y=11
1.x+y/2+x-y/3=6, 4(x+y)-5(x-y)=2 求X,Y
1/4(x+y)+1/2(x+y)*(x+y)>=x*根号y+y*根号x
若3x-2y=0,求(x+y)/(x-y)+(x-y)/(x+y)的值
已知 :4x/5y=1/3,用两种方法求(x-y):y
已知(x-y)/(x=y)=2,求(x-y)/(2x+2y)-(2x+2y)/(3x-3y)的值
3(x+y)(x-y)+4(x-y)^2=?
已知实数x,y满足关系式x^2+y^2-6x-4y+12=0.求(1)y/x (2)x^2+y^2 (3)x-y的最大值和最小值
已知x^2+y^2-4x+y+4/1/4=0,求y^-x+3xy