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2)
a)48/100
b)32
c)3
3)
(5x-2)^2+(4-5x)(4+5x)=0
-20x+4+16x=0
4x=4
x=1
4) 2200--> 88%
x------> 100%
2200*100/88=2500
5) x (90+2*70)=13800
x=60
60-stołów
120- krzesel