Question

a)12/15+ 5               b)7/10-3/5   c)3/5x5/6        d)3/5:

Answer 1

a) = 29/5

b) = 1/10

c) = 1/2

d) ?

Answer 2

a) \(\dfrac{12}{15}+5=\dfrac{4}{5}+5=\dfrac{4}{5}+\dfrac{25}{5}=\dfrac{29}{5}\)

b) \(\dfrac{7}{10}-\dfrac{6}{10}=\dfrac{1}{10}\)

c) \(\dfrac{3}{5}x\dfrac{5}{6}=\dfrac{15}{30}=\dfrac{1}{2}\)

d) lỗi 

Answer 3

a) \(\dfrac{12}{15}+5=\dfrac{4}{5}+5=\dfrac{4}{5}+\dfrac{5}{1}=\dfrac{4}{5}+\dfrac{25}{5}=\dfrac{29}{5}\)

b) \(\dfrac{7}{10}-\dfrac{3}{5}=\dfrac{7}{10}-\dfrac{6}{10}=\dfrac{1}{10}\)

c) \(\dfrac{3}{5}\times\dfrac{5}{6}=\dfrac{3\times5}{5\times6}=\dfrac{15}{30}=\dfrac{1}{2}\)

d) Thiếu số