已知{ax+2by=c,2ax-by=3c的解是.则a:b:c=_________已知{ax+2by=c{2ax-by=3c的解是{x=2{y=-1则a:b:c=_________

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已知{ax+2by=c,2ax-by=3c的解是.则a:b:c=_________已知{ax+2by=c{2ax-by=3c的解是{x=2{y=-1则a:b:c=_________
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已知{ax+2by=c,2ax-by=3c的解是.则a:b:c=_________已知{ax+2by=c{2ax-by=3c的解是{x=2{y=-1则a:b:c=_________
已知{ax+2by=c,2ax-by=3c的解是.则a:b:c=_________
已知
{ax+2by=c
{2ax-by=3c
的解是
{x=2
{y=-1
则a:b:c=_________

已知{ax+2by=c,2ax-by=3c的解是.则a:b:c=_________已知{ax+2by=c{2ax-by=3c的解是{x=2{y=-1则a:b:c=_________
把x=2,y=-1代入
2a-2b=c
4a+b=3c
2a-2b=c,6a-6b=3c
6a-6b=4a+b
2a=7b
a:b=7:2
2a=7b
2a-2b=c
7b-2b=c
c=5b
b:c=1:5=2:10
a:b:c=7:2:10

2(ax+by-ax)-(ax+by)^2-(by-ax)^2 其中a=-3 b=0.52(ax+by)(by-ax)-(ax+by)^2-(by-ax)^2 已知方程组{ax+3by=c,2ax-by=5c 2(ax+by)*(by-ax)-(ax+by)²-(by-ax)²,其中a=-3,x=2分之1 xoy平面上,ax+by=c,ax+by>c,ax+by》c,ax+by 已知方程组{ax-2by=3c,2ax-by=2c的解是{x=1,y=2,求a:b:c 已知(aX+3bY=C 2aX-bY=5c 的解是 X=1 Y=2,求a:b:c 已知ax+3by=c 2ax-by=5c的解是x=1y=2求a:b:c的值 已知{ax+3by=c,2ax-by=5c的解是{x=1,y=2,求c分之a+b 已知 ax+3by=c 求a:b:c的值2ax-by=5cx=1y=2 2(ax+by)*(by-ax)-(ax-by)^2-(by-ax)^2,其中a=-3,b=1/2 (先化简,再求值) ax+bx=3,ax^2+by^2=7,ax^3+by^3=16,ax^4+by^4=42,求ax^5+bx^5. ax+bx=3,ax^2+by^2=7,ax^3+by^3=16,ax^4+by^4=42,求ax^5+bx^5. 已知{ax+2by=c,2ax-by=3c的解是.则a:b:c=_________已知{ax+2by=c{2ax-by=3c的解是{x=2{y=-1则a:b:c=_________ 已知ax+by=7,ax^2+by^2=49,ax^3+by^3=133,ax^4+by^4=406.求:2001(x+y)+6xy-17/2(a+b)的值 已知ax+by=7,ax^2+by^2=49,ax^3+by^3=133,ax^4+by^4=406,求2008(x+y)+2008xy+(a+b)/21的值 已知ax+by=7,ax^2+by^2=49,ax^3+by^3=133,ax^4+by^4=406.求:2008(x+y)+2008xy+(a+b)/21 已知ax+by=7ax^2+by^2=49ax^3+by^3=133ax^4+by^4=406试求1995(x+y)+6xy-17/2(a+b)的值过程要详细已知ax+by=7,ax^2+by^2=49,ax^3+by^3=133,ax^4+by^4=406 试求1995(x+y)+6xy-17/2(a+b)的值 已知ax+by=7 ax²+by²=49 ax³+by³=133 ax^4+by^4=406已知ax+by=7 ax²+by²=49 ax³+by³=133 ax^4+by^4=406(1)求a+b ,x+y,xy的值(2)请问ax^5+by^5的值是有理数吗?(2)请问ax^5+by^5的值是有理数吗?