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1. L= 1/4 + 7 + 21/4 = 7 23/4 = 12 3/4
2. O=11cm
a=3x/8
b=x
2*3x/8 + 2x = 11
6x + 16x = 88
22x = 88
x = 4 - odpowiedź
3. 2/3x + 10 + 1/5x = x /*15
10x + 150 + 3x = 15x
13x - 15x = - 150
-2x = - 150
x = 75
Myśle że będzie dobrze. Powodzenia