高一数学 不等式问题 在线等
(1)1/X<1(2)(4X+3)/(X-1)>5(3)1/(X-4)<=1-X/(4-X)谢谢...
(1)
1/X<1
(2)
(4X+3)/(X-1)>5
(3)
1/(X-4)<=1-X/(4-X)
谢谢 展开
1/X<1
(2)
(4X+3)/(X-1)>5
(3)
1/(X-4)<=1-X/(4-X)
谢谢 展开
2个回答
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(1)1/x<1
=>(1-x)/x<0
=>x(x-1)>0
x>1或x<0
(2)(4x+3)/(x-1)>5
=>5(x-1)/(x-1)-(4x+3)/(x-1)<0
=>(x-8)/(x-1)<0
=>(x-8)(x-1)<0
1<x<8
(3)这题右边的是1-x/(x-4)还是(1-x)/(x-4)
若是第一种情况
1/(X-4)<=1-X/(4-X)
1/(x-4)-(x-4)/(x-4)+x/(x-4)<=0
5/(x-4)<=0
x<4
若是第二种情况
(x-2)(x-4)>=0
x<2或x>4
=>(1-x)/x<0
=>x(x-1)>0
x>1或x<0
(2)(4x+3)/(x-1)>5
=>5(x-1)/(x-1)-(4x+3)/(x-1)<0
=>(x-8)/(x-1)<0
=>(x-8)(x-1)<0
1<x<8
(3)这题右边的是1-x/(x-4)还是(1-x)/(x-4)
若是第一种情况
1/(X-4)<=1-X/(4-X)
1/(x-4)-(x-4)/(x-4)+x/(x-4)<=0
5/(x-4)<=0
x<4
若是第二种情况
(x-2)(x-4)>=0
x<2或x>4
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