Question

упростите2/7*(14a-3 целых 1/2b)-1,2*(5/6a-0,5b).

Answer 1

2/7*(14a-3 1/2b)-1,2*(5/6a-0,5b)=14a*2/7-3 1/2b*2/7-1.2*5/6a+1.2*0.5b=
=2a*2-9/2b*2/7-1 2/10*5/6a+1 2/10*5/10b=4a-9/7b-12/10*5/6a+12/10*5/10b=
=4a-9/7b-a+3/5b=(4a-a)-(9/7b-3/5b)=3a-(45/35b-21/35b)=3a-24/35b