作业帮2/x+3/y=25% 4/x+(x+2)/y=1这个方程组的具体求解过程
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2/x+3/y=25% 4/x+(x+2)/y=1这个方程组的具体求解过程
2/x+3/y=25% 4/x+(x+2)/y=1
这个方程组的具体求解过程
2/x+3/y=25% 4/x+(x+2)/y=1这个方程组的具体求解过程
方程2减去方程1的2倍.得到y=2x-8.然后代入方程1,整理后得到x^2-18x+32=0,解得x=2和16,则y=-4和24.
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
2（x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
（x+y）/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
3^x+2x=y,x
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
求值域 1,y=(x+2)/(x*x+3x+6) 2,y=3x/(x*x+4)
若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7
已知2y-x=-3,求[4y(2x-y)-2x(2x-y)]/(2x-y
x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=?