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11.a
S=(a+b)h/2 /*2
2S=ah+bh
2s-bh/h=a
12B
2+8+2*pierwiastek z 16
2+8+2*4=18
13.B
14.A
1:400 000cm
1cm:4km
1,5cm-x
x=1,5*4/1=6
15.D
16C
(x+7)^2=x^2+14x+49
17B
18.A
19A
20.7x^2-5 C
21.C
22.C
ax+ay=3
a(x+y)=3
a=3/x+y