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6x-4(2-x)≥1
6x+4x≥1+8
10x≥9
x≥9/10
x∈<9/10,∞)
2.
5-6√5+9-2√5+6+16√5+20=8√5+40
b)
-1+√3-√5+2+√5 +4-2√3= (jeżeli w ostatnim było I√3-2I
=5-2√3