x+y=35 2x-y=4
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x+y=352x-y=4x+y=352x-y=4x+y=352x-y=4x+y=35(1)2x-y=4(2)(2)+(1)得:3x=39X=13将x=13带入(1)得:y=22所以(括号)x=13y=
x+y=35 2x-y=4
x+y=35 2x-y=4
x+y=35 2x-y=4
x+y=35 (1)
2x-y=4 (2)
(2)+(1)得:3x=39
X=13
将x=13带入(1)得:y=22
所以(括号) x=13
y=22
过程就是这样的,不懂可以问,格式恩.
这是很基础的,慢慢来,以后就会觉得简单了.
X=13 Y=22
x=13 , y=22
x+y=35 ①
2x-y=4②
①+②=3x=39
x=13,将x=13代入①得:
y=35-13=22
祝学习进步!
x+y=35 式1
2x-y=4 式2
由式1加式2,得
x+2x=35+4
解得 x=13
针x=13代入式1
得13+y=35
解得 y=22
故x=13 y=22即为所求
x= 13
y=22
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
(x-4y)(2x+y)=
4x方y/(x-2y)(x+2y)怎么算[x方/x-2y]-4x方y/(x-2y)(x+2y)=?
x+y=35 2x-y=4
3(2x-y)+4(x-2y)=35
y'=(y/x)^2+y/x+4微分方程
x*x+2x+y*y-4y+5=0 x= y=
如果|X|=4 |Y|=2 且|X+Y|=X+Y 求X+Y
(x+y)^2(x-y)^2(x^4+x^2y^2+y^4)=?
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
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
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
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