znajdz niewiadomą w proporcji :A) 1,6 = 2 B) 0,6:0,4 =4,5 :3y C) 2z -4 = 2z +7 --------- ----------------- 3 x 6 5
a)
1,6x = 2*3
1,6x =6 /:1,6
x =6 * 10/16
x = 30/8
x = 3 3/4
b)
0,6*3y =0,4*4,5
1,8y = 1,8 /:1,8
y= 1
c)
5(2z-4) =6(2z+7)
10z - 20 = 12z + 42
-2z = 62 /:(-2)
z=-31
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a)
1,6x = 2*3
1,6x =6 /:1,6
x =6 * 10/16
x = 30/8
x = 3 3/4
b)
0,6*3y =0,4*4,5
1,8y = 1,8 /:1,8
y= 1
c)
5(2z-4) =6(2z+7)
10z - 20 = 12z + 42
-2z = 62 /:(-2)
z=-31