zad.1 wyznacz ze wzoruwskazane wielkości:
a) P=(a+b)h/2;a
b) 3b+a=5;b
c) 2a+2b=10;a
a)
b)
c)
P=(a+b)h/2 /*2
2P = (a +b)*h /:h
2P/h = a +b
a = 2P/h - b
3b+a=5;b
3b = 5 - a /:3
b = (5 - a)/3
2a+2b=10;a
2a = 10 - 2b
a = (10 - 2b)/2
a = 5 - b
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a)
b)
c)
a)
P=(a+b)h/2 /*2
2P = (a +b)*h /:h
2P/h = a +b
a = 2P/h - b
b)
3b+a=5;b
3b = 5 - a /:3
b = (5 - a)/3
c)
2a+2b=10;a
2a = 10 - 2b
a = (10 - 2b)/2
a = 5 - b