Question

(39/65+0,415-33/100).21/9

Tính gt bt: 21/54+3/75: --------------------------------

7²-18,25+13+15/36-16 17/102

Answer 1

Câu 2: 

\(=\dfrac{7}{18}+\dfrac{1}{25}=\dfrac{175+18}{450}=\dfrac{193}{450}\)