若a~e满足下列式子:是方程组2a+b+c+d+e=6,a+2b+c+d+e=12,a+b+2c+d+e=k且3d+2e=181,a+b+c+2d+e=48若a~e满足下列式子:是方程组⑴2a+b+c+d+e=6,⑵a+2b+c+d+e=12,⑶a+b+2c+d+e=k且3d+2e=181,⑷a+b+c+2d+e=48,⑸a+b+c+d+2e=46.求k.
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若a~e满足下列式子:是方程组2a+b+c+d+e=6,a+2b+c+d+e=12,a+b+2c+d+e=k且3d+2e=181,a+b+c+2d+e=48若a~e满足下列式子:是方程组⑴2a+b+c+d+e=6,⑵a+2b+c+d+e=12,⑶a+b+2c+d+e=k且3d+2e=181,⑷a+b+c+2d+e=48,⑸a+b+c+d+2e=46.求k.
若a~e满足下列式子:是方程组2a+b+c+d+e=6,a+2b+c+d+e=12,a+b+2c+d+e=k且3d+2e=181,a+b+c+2d+e=48
若a~e满足下列式子:是方程组⑴2a+b+c+d+e=6,⑵a+2b+c+d+e=12,⑶a+b+2c+d+e=k且3d+2e=181,⑷a+b+c+2d+e=48,⑸a+b+c+d+2e=46.求k.
若a~e满足下列式子:是方程组2a+b+c+d+e=6,a+2b+c+d+e=12,a+b+2c+d+e=k且3d+2e=181,a+b+c+2d+e=48若a~e满足下列式子:是方程组⑴2a+b+c+d+e=6,⑵a+2b+c+d+e=12,⑶a+b+2c+d+e=k且3d+2e=181,⑷a+b+c+2d+e=48,⑸a+b+c+d+2e=46.求k.
令s=a+b+c+d+e,则有:
a=6-s
b=12-s
d=48-s
e=46-s
四式相加得:a+b+d+e=112-4s
∴s=a+b+c+d+e=112-4s+c
得c=5s-112,k=s+c=6s-112
由3d+2e=181,得:3(48-s)2+(46-s)=181
求得:s=11
∴k=6×11-112=-46
(4)-(5)得d-e=2,与3d+2e=181联立求的d,e值;刚才求得的d,e值代入(4)+(5)式,求的a+b+c的值分别带入(1),(2)式可求的a,b值,从而得到c值,最后把所有求得的值代入(3)便可求的k值!!!