Question

Află numărul necunoscut:[a+5-309:3)x3-2007]x5-35:5-72:8+9=2018

Answer 1

a=902
sper sa intelegi :) (ignora taieturile)

Answer 2

Răspuns

[ ( a + 5 - 309 : 3 ) × 3 - 2007 ] × 5 - 35 : 5 - 72 : 8 + 9 = 2018

[ ( a + 5 - 103 ) × 3 - 2007 ] × 5 - 7 - 9 + 9 = 2018

[ ( a + 5 - 103 ) × 3 - 2007 ] × 5 = 2018 - 9 + 9 + 7 → aplic metoda mersului invers

[ ( a + 5 - 103 ) × 3 - 2007 ] × 5 = 2025

( a + 5 - 103 ) × 3 - 2007 = 2025 : 5

( a + 5 - 103 ) × 3 - 2007 = 405

( a + 5 - 103 ) × 3 = 405 + 2007

( a + 5 - 103 ) × 3 = 2 412

a + 5 - 103 = 2 412 : 3

a + 5 - 103 = 804

a + 5 = 804 + 103

a + 5 = 907

a = 907 - 5

a = 902 → numarul