已知关于x的分式方程1加x除以2减x等于2m除以x平方减4的解也是不等式组
2个回答
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①
1/2-x>x-2
1/2+2>2x
5/2>2x
x<5/4
②
2*(x-3)≤x-8
2x-6≦x-8
2x-x≦6-8
x≦-2
①∩②得:
x≦-2
故不等式组的解为x≦-2
(1+X)/(2-X)=2M/(X²-4)
-(X+1)(X+2)/(X²-4)=2M/(X²-4)
-(X+1)(X+2)=2M
M=(-X²-3X-2)/2
=-1/2(X+3/2)²+1/8
∵x≦-2
M=-1/2(X+3/2)²+1/8
≤-1/2(-2+3/2)²+1/8
=0
M≤0
1/2-x>x-2
1/2+2>2x
5/2>2x
x<5/4
②
2*(x-3)≤x-8
2x-6≦x-8
2x-x≦6-8
x≦-2
①∩②得:
x≦-2
故不等式组的解为x≦-2
(1+X)/(2-X)=2M/(X²-4)
-(X+1)(X+2)/(X²-4)=2M/(X²-4)
-(X+1)(X+2)=2M
M=(-X²-3X-2)/2
=-1/2(X+3/2)²+1/8
∵x≦-2
M=-1/2(X+3/2)²+1/8
≤-1/2(-2+3/2)²+1/8
=0
M≤0
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