3x-7y=0 5(x-2)+3y+6)=1用代入法解,急用,3x-7y=0 5(x-2)+3(y+6)=1不好意思括号打错了.求X=y=
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3x-7y=05(x-2)+3y+6)=1用代入法解,急用,3x-7y=05(x-2)+3(y+6)=1不好意思括号打错了.求X=y=3x-7y=05(x-2)+3y+6)=1用代入法解,急用,3x-
3x-7y=0 5(x-2)+3y+6)=1用代入法解,急用,3x-7y=0 5(x-2)+3(y+6)=1不好意思括号打错了.求X=y=
3x-7y=0 5(x-2)+3y+6)=1
用代入法解,急用,
3x-7y=0 5(x-2)+3(y+6)=1
不好意思括号打错了.
求X=
y=
3x-7y=0 5(x-2)+3y+6)=1用代入法解,急用,3x-7y=0 5(x-2)+3(y+6)=1不好意思括号打错了.求X=y=
3x = 7y (1),
5x + 3y = -7 (2)
(1)式乘以5,(2)式乘以3,得
15x = 35y (3),
15x + 9y = -21 (4)
将(3)代入(4),得
35y + 9y = 44y = -21,解得 y = -21/44
将 y=-21/44 代入(1),解得 x = -49/44
(验证略)所以,x=-49/44 y=-21/44
3x+5y-(x+y)=6 2(x+y)-3x=-7
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,无
(x+y-5)*(x+y-5)+(x-y+3)=0 x*x-y*y
已知:3x-5y=0,求x/y,x-y/y,x-y/x
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)= 3(x-y)把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)=3(x-y)²-4(x-y)+7(x-y)-6(x-y)²=
{x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0
把(x-y)看做一个整体,合并同类项5(x-y)+2(x-y)-4(x-y)=3(x-y)次方-4(x-y)+7(x-y)-6(x-y)次方=
{2x+y/3-2y=0 2(2x+y)-5=7y
实数x,y满足2x+5y>=0,2x-3y>=-6,2x+y
大括号x+y/2+x-y/3=11/6 4(x+y)-5(x-y)=7 快
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
2(x-2y)²-7(x-2y)³+3(2y-x)²+(2y-x)³合并同类项 这个式子2(x-2y)²-7(x-2y)³+3(2y-x)²-(2y-x)³=2(x-2y)²-7(x-2y)³+3(x-2y)²+(x-2y)³=5(x-2y)²-6(x-2y)³=(x-2y)²(5-6x+12y)
已知:2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x)
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)