Question

b5+b3=60 b7-b5=144 надо найти b4

Answer 1

7b-5b=144
2b=144
b=72

5b+3b=60
8b=60
b=60
8
b=15
2

Answer 2

Ой

Answer 3

Ой b=15

Answer 4

B=15 в внизу 2