(1)5x+1 ≤ 7x+5(2)1-2x > 6x+5(3)x-1.5 < 4乘以(1+x)的积再除以3然后 -1≤ (4+x)除以2还有第4题:4(1+x)除以3再-1≤(4+x)除以2
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![(1)5x+1 ≤ 7x+5(2)1-2x > 6x+5(3)x-1.5 < 4乘以(1+x)的积再除以3然后 -1≤ (4+x)除以2还有第4题:4(1+x)除以3再-1≤(4+x)除以2](/uploads/image/z/15238884-12-4.jpg?t=%EF%BC%881%EF%BC%895x%2B1+%E2%89%A4+7x%2B5%EF%BC%882%EF%BC%891-2x+%3E+6x%2B5%EF%BC%883%EF%BC%89x-1.5+%3C+4%E4%B9%98%E4%BB%A5%EF%BC%881%2Bx%EF%BC%89%E7%9A%84%E7%A7%AF%E5%86%8D%E9%99%A4%E4%BB%A53%E7%84%B6%E5%90%8E+-1%E2%89%A4+%EF%BC%884%2Bx%EF%BC%89%E9%99%A4%E4%BB%A52%E8%BF%98%E6%9C%89%E7%AC%AC4%E9%A2%98%EF%BC%9A4%EF%BC%881%2Bx%EF%BC%89%E9%99%A4%E4%BB%A53%E5%86%8D-1%E2%89%A4%EF%BC%884%2Bx%EF%BC%89%E9%99%A4%E4%BB%A52)
(1)5x+1 ≤ 7x+5(2)1-2x > 6x+5(3)x-1.5 < 4乘以(1+x)的积再除以3然后 -1≤ (4+x)除以2还有第4题:4(1+x)除以3再-1≤(4+x)除以2
(1)5x+1 ≤ 7x+5
(2)1-2x > 6x+5
(3)x-1.5 < 4乘以(1+x)的积再除以3然后 -1≤ (4+x)除以2
还有第4题:4(1+x)除以3再-1≤(4+x)除以2
(1)5x+1 ≤ 7x+5(2)1-2x > 6x+5(3)x-1.5 < 4乘以(1+x)的积再除以3然后 -1≤ (4+x)除以2还有第4题:4(1+x)除以3再-1≤(4+x)除以2
5x-7x ≤4
-2x≤4
x大于等于-2
-8x >4
x小于 负二分之一
第三题写清楚点
①5x-7x≤4
-2x≤4
∴x≥-2
②-2x-6x>4
-8x>4
∴x<-1/2
③先解左边x-1.5<[4(1+x)/3]-1
x-1.5<4/3+(4/3)x-1
x-1.5<1/3+(4/3)x
-(1/3)x<11/6
∴x>-11/2
再解右边[4(1+x)/3]-1≤(4+x)/2
...
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①5x-7x≤4
-2x≤4
∴x≥-2
②-2x-6x>4
-8x>4
∴x<-1/2
③先解左边x-1.5<[4(1+x)/3]-1
x-1.5<4/3+(4/3)x-1
x-1.5<1/3+(4/3)x
-(1/3)x<11/6
∴x>-11/2
再解右边[4(1+x)/3]-1≤(4+x)/2
1/3+(4/3)x≤2+(1/2)x
(5/6)x≤5/3
x≤2
∴x-1.5<[4(1+x)/3]-1≤(4+x)/2的解为-11/2<x≤2
④[4(1+x)/3]-1≤(4+x)/2
4/3+(4/3)x-1≤2+(1/2)x
(4/3)x+1/3≤2+(1/2)x
(5/6)x≤5/3
∴x≤2
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