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9 X 0,5h= 45
0,5h= 45 : 9
0,5h= 5\: 0,5
h= 10
b) (10 x a) : 2= 72
5 x 0,5a= 72
0,5a= 72 : 5
0,5a= 14,4/:0,5
a= 28,8
c) ( 5 x h) : 2= 40
2,5 x 0,5h= 40
0,5h= 40 : 2,5
0,5h= 16\: 0,5
h= 32
a)P=45
a=18
h=2P/a
h=2*45/18
h=90/18
h=5
b)p=72
h=10
a=2P/h
a=2*72/10
a=14,4
c)p=40
h=5
a=2p/h
a=2*40/5
a=16
d)p=50
50=1/2 ah
100=ah
a=10
h=10