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(5x-0,2)/14-x-0,1 ≤ ¹/₇-(x-0,02)/2 |*14
5x-0,2-14x-1,4 ≤ 2-(7x-0,14)
-9x-1,6 ≤ 2-7x+0,14
-9x-1,6 ≤ 2,14-7x
-9x+7x ≤ 2,14+1,6
-2x ≤ 3,74 |:(-2)
x ≥ -1,87
c)
(x-2)/(√3-1)-2x-√3 ≤ x/(√3+1)
[(x-2)/(√3-1)]*[(√3+1)(√3+1)]-2x-√3 ≤ [x/(√3+1)]*[(√3-1)(√3-1)]
{[(x-2)(√3+1)]/(3-1)}-2x-√3 ≤ [x(√3-1)]/(3-1)
[(x-2)(√3+1)]/2-2x-√3 ≤ [x(√3-1)]/2 |*2
(x-2)(√3+1)-4x-2√3 ≤ x(√3-1)
x√3+x-2√3-2-4x-2√3 ≤ x√3-x
x√3-4√3-2-3x ≤ x√3-x
-4√3-2-3x ≤ -x
-4√3-2 ≤ -x+3x
-4√3-2 ≤ 2x
2x ≥ 2(-2√3-1) |:2
x ≥ -2√3-1
5x -0,2 -14x- 1,4< 2- 7(x-0,02)
-9x-1,6< 2-7x+0,14
-9x+7x<2,14+1,6
-2x< 3,74 |:(-2)
x> -1,87
b) x-2/pier3-1 -2x-pier3< x/pier3+1 |*(pier3-1)
x-2-2x(pier3-1)-pier3(pier3-1)<x*(pier3-1)/pier3+1
x-2-2pier3x +2x -3+pier3<pier3x -x/pier3+1
3x-2pier3x -5+pier3< pier3x -x/pier3 +1 |*(pier3+1)
3x(pier3+1)-2pier3x(pier3+1)-5(pier3+1)+pier3(pier3+1)<pier3-x
3pier3x+3x-6x-2pier3x-5pier3-5+3+pier3<pier3x-x
pier3x-3x-4pier3-2<pier3x-x [pier3x się skraca]
-3x+x<4pier3+2
-2x<4pier3+2 |:(-2)
x>-2pier3-1