Question

Afla numărul necunoscu:
(630+a):3=427 a)
(1000-a):4=128 b)
(2100-a):4=376 c)

DAU COROANĂ PLSSSSS VĂ ROG REPEDE!!

Answer 1

a)
(630+a):3=427
630+a=427×3
630+a=1281
a=1281-630
a=651

Probă :

(630+651):3=
=1281:3=
=427 (adevarat )






b)
(1000-a):4=128
1000-a=128×4
1000-a=512
a=1000-512
a=488

Probă :

(1000-488):4=
=512:4=
=128 (adevarat )






c)
(2100-a):4=376
2100-a=376×4
2100-a=1504
a=2100-1504
a=596

Probă :

(2100-596):4=
=1504:4=
=376 (adevarat )