pomocy !! rozwiąż podane równania korzystając z własnosci proporci a)x-3:4 b) 0,6/x =7200/3000 c)x-5/5=2x-7/4
a)
x-3=4
(x-3)/1=4/1
(x-3)*1 = 1*4
x = 4+3
x = 7
b)
0,6/x =7200/3000
x*7200 = 0,6*3000
7200x = 1800 /:7200
x = 0,25
c)
x-5/5=2x-7/4
(x-5)*4 = (2x-7)*5
4x-20=10x-35
-6x = -15 /:(-6
x = 15/6 = 5/2
x = 2 1/2
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a)
x-3=4
(x-3)/1=4/1
(x-3)*1 = 1*4
x-3=4
x = 4+3
x = 7
b)
0,6/x =7200/3000
x*7200 = 0,6*3000
7200x = 1800 /:7200
x = 0,25
c)
x-5/5=2x-7/4
(x-5)*4 = (2x-7)*5
4x-20=10x-35
-6x = -15 /:(-6
x = 15/6 = 5/2
x = 2 1/2