作业帮4x+2y=16 x-y=1,
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4x+2y=16 x-y=1,
4x+2y=16 x-y=1,
4x+2y=16 x-y=1,
二式乘以2,相加的,6x=118,得x=3,y=2
x=3 y=2,xy=6
x=1+y
4(1+y)+2y=16
4+4y+2y=16
6y=12
y=2
x=3
有方程组解得x=3，y=2，因此xy=6。
4x+2y=16 ------①
x-y=1 -------②
②*2+①：6x=18
x=3 将其带入②式得
y=3-1=2
xy=3*2=6
若x-y=1 化简（x+y)(x^2+y^2)(x^4+y^4)(x^8+y^8)(x^16+y^16)
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
4x+2y=16 x-y=1,
x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=?
（x-4y=-1 2x+y=16) (x-y=1 2x+y=5 )
2(x-y)/3-(x+y)/4=-1 (1) 6(x+y)-4(2x-y)=16 (2)
解方程组2(x-y)/3-x+y/4=-1 6(x-y)-4(2x-y)=16
解方程组：2(x-y)/3-x+y/4=-1 ,6(x+y)-4(2x-y)=16
2(X-Y)/3=(X+Y)/4 -1 6(X+Y)=4(2X-Y)+16解方程
6(x+y)=4(2x-y)+16,2(x-y)/3=x+y/4-1
2(x-y)/3—x+y/4=1 6(x+y)—4(2x-y)=16
3分之2(x-y)-4分之x+y=-1 8(x+y)-4(2x-y)=16
(2x-2y)/3-(x-y)=-1和6(x+y)-4(2x-y)=16
3分之2(X-Y)-4分之X+Y=-1,3(X+Y)-2(X-Y)=16
初二上学期方程题 4x+y=5 5x+4y=63x-2y=1 2x+3y=13x-2y=7 7x+5y=32x+3y=17 2x-y=-4x+5y=6 2x+y=23x-6y=4 3x+2y=52x+y=73x-4y=53x+y=1x-2y=-1x+y=42x+3y=92x-3y=74x+5y=3x+y=20004x+6y=90003x+5y=113x-2y=42x+3y=215x-2y=5x+y=54x+3y=182x+3y=16x+4y=132x+3y=40x
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
已知:【(x²+y²)-(x-y)²+2y(x-y)】/4y=1,求4x/4x²-y²-1/2x+y