Răspuns:
Explicație pas cu pas:
a) x = (12*3)/4 = 3*3 = 9
b) x = (36*5)/6 = 6*5 = 30
c) x = (1000*3)/25 = 40 * 3 = 120
d) x = (3*17)/6 = 17/2
e) 2x = 15/4 => x = (15/4):2 = (15/4)*(1/2) = 15/8
f) 8x-40 = 16 => 8x = 56 => x = 7
g) 5x - 10 = 4x + 12 => 5x - 4x = 10 + 12 => x = 22
h) 21x - 35 = 40 - 4x => 21x + 4x = 35 + 40 => 25x = 75 => x = 75/25 = 3
i) 7*(30+x) = 3*(10x+1) => 210 + 7x = 30x + 3 => 210 - 3 = -7x + 30x => 207 = 23x => x = 207/23 = 9
