Wyznacz x : a)2x+1=m b) 3x/7 =2ny c) 4x+6=2xy-3y Rozwiąż : 2x+1/ 4 4x-2(3-x)-(x+1) >/ 3 4x-1/2 -3x+1/3 / - większe lub równe
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a)
2x+1=m
2x=m-1 /:2
x=(m-1)/2
b)
3x/7 = 2ny /*7
3x=14ny /:3
x=14ny/3
c)
4x+6=2xy-3y
4x-2xy=-3y-6
x(4-2y)=-3y-6 /:(4-2y)
x=(-3y-6)/(4-2y)
2x+1/4 + 4x-2(3-x)-(x+1) ≥ 34x-1/2-3x+1/3
2x+1/4+4x-6+2x-x-1 ≥31x-1/2+1/3
7x-31x ≥-1/2+1/3-1/4+7
-24x ≥-6/12 + 4/12 + 3/12 + 7
-24x ≥1+7
-24x ≥8
x ≤ -3