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a=6
h=5
P=a×h/2
P=6×5/2 = 30/2= 15
p=½ 5*6
p½ 30
p=15
6:2=3
3² + h² =7²
9 +h² =49
h²=49-40
h=√40
P = 6*√40 * ½ = 3√40
2.
x-liczba psów
y-liczba ptakow
4x+2y=96
x+y=40
x=40-y
4(40-y)+2y=96
160-4y+2y=96
-2y=96-160
-2y=-64 /:(-2)
y=32
x=40-32=8
Psów 8, ptaków 32