Question

1) 1/2a + 1/3a +1/6 a,а =12
2) 8,7b - 5,3b,b =2
3) 2,9c + 6,3c - 4,2c,c =1,2

Answer 1

...6+4+2=12
...3,4*2=6,8
...5*1,2=6