2.9x+4y=35 8x+3y=30
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2.9x+4y=35 8x+3y=30
2.9x+4y=35 (1)
8x+3y=30 (2)
4(2)-3(1)得
32x+12y-(8.7x+12y)=120-105
23.3x=15
x=150/233
带入(1)式,或(2)式就可以算出来了.
8x+3y=30 (2)
4(2)-3(1)得
32x+12y-(8.7x+12y)=120-105
23.3x=15
x=150/233
带入(1)式,或(2)式就可以算出来了.
二元一次方程组试题1.2x+9y=81 3x+y=34 2.9x+4y=35 8x+3y=30 3.7x+2y=52 7
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
9y=3x-(x-1),4(x+y)-(2x+4)=8y
已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
{3(x+y)+3(y+x)=1,3(x+y)+4(y-x)=-1
{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
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27