Question

Tính và rút gọn 

a) 15x7/30x11

b) 4x5x6/12x15x9

c) 6x8x11/33x16

Answer 1

Giúp em với

Answer 2

\(\dfrac{15\times7}{30\times11}=\dfrac{15\times7}{15\times2\times11}=\dfrac{7}{2\times11}=\dfrac{7}{22}\)

\(\dfrac{4\times5\times6}{12\times15\times9}=\dfrac{4\times5\times2\times3}{4\times3\times5\times3\times3\times3}=\dfrac{2}{3\times3\times3}=\dfrac{2}{27}\)

\(\dfrac{6\times8\times11}{33\times16}=\dfrac{3\times2\times8\times11}{3\times11\times8\times2}=1\)