А) 3х≤5
х≤5/3
х≤1 ²/₃
----------- 1²/₃ ---------------
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б) -2х+1 <8<br>-2x<8-1<br>-2x<7<br>x>7 : (-2)
х> -3.5
------------ -3.5 ---------------
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в) -3х > -7
x < -7 : (-3)
х < 7/3
x < 2 ¹/₃
-------------- 2 ¹/₃ --------------------
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г) х+1 > -3
2
x+1 >-3 *2
x+1 > -6
x> -6-1
x > -7
------------------- -7 ------------------
\\\\\\\\\\\\\\\\\\\\
д) 2х-1 < 2 ¹/₄
3
2x-1 < ⁹/₄ * 3<br>2x-1 < 27/4
2x < ²⁷/₄ + 1<br>2x < ²⁷/₄ + ⁴/₄<br>2x < ³¹/₄<br>x < ³¹/₄ : 2<br>х < ³¹/₄ * ¹/₂<br>x < ³¹/₈<br>x< 3 ⁷/₈
---------------- 3 ⁷/₈ ---------------
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е) 1-х ≥ 2,3
4
1-х ≥ 2,3*4
1-х ≥ 9,2
-х ≥ 9,2-1
-х ≥ 8,2
х ≤ -8,2
-------------- -8,2 ----------------
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ж) 5(х+1)-4(2х-3)≤5х+7
5х+5-8х+12≤5х+7
-3х-5х≤7-17
-8х≤-10
х≥ -10 : (-8)
х≥ 10/8
х≥ 1,25
----------- 1,25 ----------------
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з) -2(х+7)+8(3х-4)>3x-5(x-4)
-2x-14+24x-32>3x-5x+20
22x+2x>20+46
24x>66
x>66/24
x>33/12
x> 11/4
x> 2.75
--------------- 2.75 ---------------
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и) -2(х+5)+8(х-7)<6x+11<br>-2x-10+8x-56<6x+11<br>6x-6x<11+66<br>0x<77<br>0<77<br>x - любое значение