Question

2. Află valoarea lui a, din fiecare caz.

1. 80 + 7 x a = 577

2. a ÷ 3 +383 = 507

3. 1000 - a ÷ 2 = 514

4. (307 + a ) : 8 = 107

5. (218 - 294 ÷ 7) × a = 880

50 PUNCTE.

DAU COROANA VA ROG!!

Answer 1

Răspuns:

1. 80 + 7 x a = 577=>7a=577-80=>a=497:7=>a=71

2. a ÷ 3 +383 = 507=>a:3=507-383=>a=124·3=>a=372

3. 1000 - a ÷ 2 = 514=>a:2=1000-514=>a=486·2=>a=972

4. (307 + a ) : 8 = 107=>307+a=107·8=>a=856-307=>a=549

5. (218 - 294 ÷ 7) × a = 880=>(218-42)·a=880=>a=880:176=>a=5

Answer 2

Salut,

80 + 7 × a = 577

a = (577 - 80) ÷ 7

a = 497 ÷ 7

a = 71

_____________________________

a ÷ 3 + 383 = 507

a = (507 - 383) × 3

a = 124 × 3

a = 372

_____________________________

1 000 - a ÷ 2 = 514

a = (1 000 - 514) × 2

a = 486 × 2

a = 972

_____________________________

(307 + a) ÷ 8 = 107

a = 107 × 8 - 307

a = 856 - 307

a = 549

_____________________________

(218 - 294 ÷ 7) × a = 880

(218 - 42) × a = 880

a = 880 ÷ 176

a = 5