Question

mn chỉ mik bài 6.1 với 6.2 với ạ

Answer 1

Câu 6.2
\(12:30=2.5:6.25\)

=>12/30=2,5/6,25; 12/2,5=30/6,25; 30/12=6,25/2,5; 2,5/12=6,25/30

Câu 6.1:

a: \(=\dfrac{10}{16}\cdot\dfrac{21}{4}=\dfrac{210}{64}\)

b:  \(=\dfrac{130}{275}=\dfrac{26}{55}\)

c: \(=\dfrac{-2}{5}:\dfrac{1}{4}=\dfrac{-8}{5}\)