Question

[Nguyễn Khánh Linh]

Tính:

a.19/21+14/39

b.26/30:23/15

Answer 1

[công chúa xinh xắn]

\(b,\frac{26}{30}:\frac{23}{15}\)

\(=\frac{26}{30}\times\frac{15}{23}\)

\(=\frac{26\times15}{30\times23}\)

\(=\frac{390}{690}\)

\(=\frac{13}{23}\)

Answer 2

[công chúa xinh xắn]

\(a,\frac{19}{21}+\frac{14}{39}\)

\(=\frac{741}{819}+\frac{294}{819}\)

\(=\frac{1035}{819}\)

\(=\frac{115}{91}\)