Răspuns :
( x + 8 × 10 ) - 5 × 10 = 10 × 4
( x + 80 ) - 50 = 40
x + 80 = 50 + 40
x + 80 = 90
x = 90 - 80
x = 10
( x + 80 ) - 50 = 40
x + 80 = 50 + 40
x + 80 = 90
x = 90 - 80
x = 10
Notez cu a numarul la care ma gandesc.
a + 8 × 10 - 5×10 = 10 × 4
a + 80 - 50 = 40
a + 80 = 40 + 50
a + 80 = 90
a = 90 - 80
a = 10 → numarul
Verific: 10 + 80 - 5 ×10 = 90 - 50 = 40
a + 8 × 10 - 5×10 = 10 × 4
a + 80 - 50 = 40
a + 80 = 40 + 50
a + 80 = 90
a = 90 - 80
a = 10 → numarul
Verific: 10 + 80 - 5 ×10 = 90 - 50 = 40