Question

Afla numerele necunoscute din exercitiile :
a) 7 + 6 x (x:4-18) = 25
b) 286 + (a-113):5 = 142
c) [93 : (x:3) - 16 x 4] x 6 = 186

Answer 1

a) 7 + 6 x (x:4-18) = 25
6 x (x:4-18) = 25-7
6 x (x:4-18) = 18
X:4-18 = 18:6
X:4-18 = 3
X:4 = 3+18
X:4 = 21
X = 21×4
X = 84

b) 286 + (a-113):5 = 142
(a-113):5 = 142-286
(a-113):5 = -144
a-113 = -144×5
a-113 = -720
a = -720+113
a = -607


c) [93 : (x:3) - 16 x 4] x 6 = 186
[93 : (x:3) - 64] = 186 : 6
93 : (x:3) - 64 = 31
93:(X:3) = 31+64
93:(X:3) = 95
X:3 = 93/95
X = 3×93/95
X = 279/95