zad.1przedstaw obwod kazdej z figur ,zredukuj wyrazy podobne i oblicz obwód dla a=2, b=0,5
a) 3a +2b+2a+3a+3a-b+13a-7b=
b)3b-a+3b-a+2a+3b-a+3b-a+2a+3b-a+2a+3b-a+3b-a+2a=
c)a-b+3b+b+2a-b+2a-b+b+3b=
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a)
3a +2b+2a+3a+3a-b+13a-7b = 24a - 6b
24a - 6b= 24 *2 - 6 * 0,5 = 48 -3 = 45
b)
3b-a+3b-a+2a+3b-a+3b-a+2a+3b-a+2a+3b-a+3b-a+2a =a+21b
a+21b = 2 +21*0,5=2 + 10,5 = 12,5
c)
a-b+3b+b+2a-b+2a-b+b+3b = 5a + 5b
5a + 5b = 5*2 + 5*0,5 = 10 + 2,5 = 12,5