Question

2,5*(3х+0,4)-5,1х ПРИ х=8

Answer 1

2,5*(3х+0,4)-5,1х=7,5х+1-5,1х=2,4х+1
2,4х+1 при х=8
2,4*8+1=19,2+1=20,2
Ответ:20,2

Answer 2

При х=8; 2,5(3х+0,4)-5,1х=2,5(3*8+0,4)-5,1*8=2,5(24+0,4)-40,8=61-40,8=20,2