解方程 (y^2-6x)y~ 2y=0-搜答案-拍题作业网

第一个式子减第二个式子,x=1,y=2.5

将2x-y=6带入(x+2y)(2x-y)=96得(x+2y)=16,联立2x-y=6得x=5.6,y=5.2

2x+y=4x-y-1/22x-2y-1/2=08x-8y-4=01式4x-y-1/2=10+6x+2y/42x+6y/4+21/2=08x+6y+42=02式2式-1式得到：8x+6y+42-8x+

3(y-7)-6(x-y)=3y-21-6x+6y=9y-6x-21=3(3y-2x)-21=3*(-7)-21=-42

x+y=ay=a-x代入2x²+3a²-6ax+3x²-6a+6x=05x²+(6-6a)x+(3a²-6a)=0x是实数所以△>=036-72a+3

(3x+2y)/4=（2x+y）/55*(3x+2y)=4*(2x+y)15x+10y=8x+4y7x=-6yx=-6/7y(2x+y)/5=(x-y+1)/66*(2x+y)=5*(x-y+1)12

设x+y=axy=b那么a+b=2+3√2(1)a^2-2b=6(2)(1)*2+(2)得a^2+2a=10+6√2a^2+2a+1=3^2+2*3*√2+(√2)^2所以(a+1)^2=(3+√2)

x²+2xy+6x+2y²+4y+10=0x²+2xy+y²+6x+6y+9+y²－2y+1=0(x+y)²+6（x+y）+9+y²

化简x+y=105x+7y=625x+5y+2y=622y=62-50y=6x=4

x-x-1/2=2-x+2/3-1/2=2-x+2/3x=2+2/3+1/2=3+1/6=19/6y+6=y+2/2-y-5/3y+6=2/2-5/3y=1-5/3-6y=-5-5/3=-20/3

由一得,x=1-3y/2代入二得,3-9y/2-2y=5/6所以y=1/3代入x=1-3y/2得,x=1/2∴方程组的解是x=1/2y=1/3

[(x+y)(x-y)-(x+y)^2-2y(x-y)-2xy]/xy={(x+y)[(x-y)-(x+y)]-2y(x-y)-2xy}/xy={(x+y)[(x-y-x-y)]-2y(x-y)-2x

是方程组么?x/2+y/3=2-x2x/3-y/6=y/3+17/63x+2y=12-6x4x-y=2y+172y-3x=124x-3y=17y=6+1.5x4x-3(6+1.5x)=17x=2y=9

x=9+1/2y代入第二个方程：1/3×（9+1/2y）-1/2y=63+1/6y-1/2y=6-1/3y=6-31/3y=3y=9x=9+1/2×9=13.5很高兴为您解答,【学习宝典】团队为您答题

(x/2+6)/(14y/11)=(x/2-6)/y解方程解,得：(x/2+6)*(11/14y)==(x/2-6)/y[(x/2+6)*11]/4y==(x/2-6)/y(x/2+6)*11==4(

2x+y=6x+3y+|3x-y|=19如果3x-y>=0则方程为2x+y=64x+2y=19方程无解如果3x-y

x=2y=3z=13x-y+z=42x+3y-z=12消z得5x+2y=162x+3y-z=12x+y+z=6消z得3x+4y=185x+2y=163x+4y=18合并得x=2y=3代入x+y+z=6

因为2x-y=3所以6分之2x-y=1/21/2+3+2y=9y=11/4代入2x-y=3x=23/8再问：你肯定吗?再答：确定

2x+y=2(1)-x+y=5(2)3x=-3x=-1y=4