9,7b-5,8b+4,1bприb=1,5;

Question

9,7b-5,8b+4,1bприb=1,5;

Answer 1

9,7×1,5-5,8×1,5+4,1×1,5=14,55-8,7+6,15=12
или
9,7b-5,8b+4,1b=(9,7-5,8+4,1)×b=8×b=8×1,5=12

Answer 2

9,7b-5,8b+4,1b=3,9b+4,1b=8b
приb=1,5;
=8*1,5=12