Question

18,75+17,25+15,75+14,25+5,25+3,75+2,25

Answer 1

=77.25

Answer 2

(18,75 + 2,25) + (17,25 + 3,75) + (15,75 + 5,25) + 14,25 = 21 + 21 + 21 + 14,25 = 21 x 3 + 14,25 = 63 + 14,25 = 77,25 

Chúc bạn học tốt !!!

Answer 3

\(18,75+17,25+15,75+14,25+5,25+3,75+2,25\)

\(=\left(18,75+2,25\right)+\left(17,25+3,75\right)+\left(15,75+5,25\right)+14,25\)

\(=21+21+21+14,25\)

\(=21\)X \(3+14,25\)

\(=63+14,25\)

\(=77,25\)

Answer 4

Ta có: 18,75+17,25+15,75+14,25+5,25+3,75+2,25

           =(18,75+2,25)+(17,25+3,75)+(15,75+14,25)+5,25

           =21+21+30+5,25

           =\(\frac{309}{4}\)=77,25