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E = mc²
m = E/c²
zad 2
a)
x/5 = 4/7
5 * 4 = 7x
7x = 20
x = 20/7 = 2 6/7
b)
(x + 1)/3 = x/4
3x = 4(x + 1)
3x = 4x + 4
4x - 3x = - 4
x = - 4
zad 3
a)
(2,75 + 1 5/6) : 5 = (2 3/4 + 1 5/6) : 5 = (2 18/24 + 1 20/24) : 5 =
= 3 38/24 : 5 = 110/24 * 1/5 = 22/24 = 11/12
b)
(- 10) * (- 18 + 15) = - 10 * - 3 = 30