Question

[474 + 3(4a-12)]:19 = 30.​

Answer 1

Răspuns:

a=11

Explicație pas cu pas:

$[474=3(4a-12)]:19=30\\474+3(4a-12)=30*19\\474+3(4a-12)=570\\3(4a-12)=570-474\\3(4a-12)=96\\4a-12=93:3\\4a-12=32\\4a=32+12\\4a=44\\a=44:4\\a=11$

Answer 2

Răspuns:

[474 + 3(4a-12)]:19 = 30

(474 + 12a-36):19 = 30

(474 - 36+12a):19 = 30

(438 + 12a):19 = 30

438+12a/19 = 30 |*19

438+12a=570

12a=570-438

12a=132

a=132/12

a=11