Question

bài 1 : quy đồng rồi so sánh

a)               b)

\(\frac{16}{35}va\frac{4}{7}\)\(\frac{13}{15}va\frac{11}{12}\)

Answer 1

a ) \(\frac{4}{7}\) = \(\frac{4\cdot5}{7\cdot5}\) = \(\frac{20}{35}\)

\(\frac{16}{35}\) giữ ngyên

\(\frac{16}{35}\) < \(\frac{20}{35}\) . Vậy \(\frac{4}{7}\) > \(\frac{16}{35}\)

b ) \(\frac{13}{15}\) = \(\frac{13\cdot12}{15\cdot12}\) = \(\frac{156}{180}\)

\(\frac{11}{12}\) = \(\frac{11\cdot15}{12\cdot15}\) = \(\frac{165}{180}\)

\(\frac{156}{180}\) < \(\frac{165}{180}\) nên \(\frac{13}{15}\) < \(\frac{11}{12}\)

Answer 2

khó nhỉ???mk không thích quy đồng

Answer 3

\(\frac{16}{35}\)ta quy đồng đc \(\frac{112}{185}\) 

\(\frac{4}{7}\) ta quy đồng đc \(\frac{140}{185}\)

=> \(\frac{16}{35}\)bé hơn \(\frac{4}{7}\)

Answer 4

a)\(\frac{16}{35}\)giữ nguyên

\(\frac{4}{7}=\frac{4x5}{7x5}=\frac{20}{35}\)

Vì \(\frac{16}{35}< \frac{20}{35}\) nên \(\frac{16}{35}< \frac{4}{7}\)

b)\(\frac{13}{15}=\frac{13x4}{15x4}=\frac{52}{60}\)

\(\frac{11}{12}=\frac{11x5}{12x5}=\frac{55}{60}\)

Vì \(\frac{52}{60}< \frac{55}{60}\) nên \(\frac{13}{15}< \frac{55}{60}\)

k mình nha