Question

Answer 1

2: \(\dfrac{15}{12}-\dfrac{-1}{4}=\dfrac{15}{12}-\dfrac{-3}{12}=\dfrac{18}{12}=\dfrac{3}{2}\)

3: \(=\dfrac{16}{8}+\dfrac{-3}{8}=\dfrac{13}{8}\)

4: \(=\dfrac{5}{15}-\dfrac{-6}{15}=\dfrac{11}{15}\)

Answer 2

2)15/12-(-1/4)=15/12+1/4=15/12+3/12=18/12=3/2

3)2+(-3/8)=16/8-3/8=13/8

4)1/3-(-2/5)=1/3+2/5=5/15+6/15=11/15

Chúc em học tốt

Answer 3

\(a,\dfrac{15}{12}-\dfrac{-1\times3}{4\times3}=\dfrac{15}{12}-\dfrac{-3}{12}=\dfrac{18}{12}=\dfrac{3}{2}\\ b,\dfrac{2\times8}{1\times8}+\dfrac{-3}{8}=\dfrac{16}{8}+\dfrac{-3}{8}=\dfrac{13}{8}\\ c,\dfrac{1\times5}{3\times5}-\dfrac{-2\times3}{5\times3}=\dfrac{5}{15}-\dfrac{-6}{15}=\dfrac{11}{15}\)