Question

помогите:

28,8÷13 целых пять седьмых=.....?

Answer 1

$\ 28.8/13 frac{5}{7}= frac{288}{10}/ frac{96}{7}= frac{288}{10}* frac{7}{96}= frac{3}{10} *7=0.3*7=2.1$

Answer 2

28,8=288/10=144/5
13целых5/7=96/7
144/5:96/7=144/5*7/96=(48*7)/(5*32)
=(6*7)/(5*4)=21/10=2,1