2,5*(3х+0.4)-5,1х при х=8

Question

2,5*(3х+0.4)-5,1х при х=8

Answer 1

7.5x+1-5.1x
2.4x+1
19.2+1=20.2

Answer 2

7.5х+2.9-5.1х 7.5х-5.1х+2.92.4х+2.9 при х=8
2.4*8+2.9=19.2+2.9=22.1