Question

(4/13х-3/26)*39 =13 1/2

Answer 1

(4/13х-3/26)*39 =13 1/2
4/13х-3/26=13 1/2:39
4/13х-3/26=9/26
4/13х=3/26+9/26
4/13х=12/26
х=12/26:4/13
х=1 1/2

Answer 2

а откуда 4

Answer 3

ясно

Answer 4

я ошиблась