Question

tính theo mẫu

mẫu : 15 x7 / 30 x11 = 15 x 7 / 15 x 2 x 11= 7/22

a) 4 x 5 x 6/12 x 15 x 9

b) 6 x 8 x 11/ 33 x 16

bài này là phân số

Answer 1

a.\(\dfrac{4.5.6}{12.15.9}\)
\(=\dfrac{4.5.3.2}{4.3.5.3.3.3}\)
\(=\dfrac{2}{3.3.3}=\dfrac{2}{27}\)
b.\(\dfrac{6.8.11}{33.16}\)
\(=\dfrac{2.3.8.11}{3.11.8.2}\)
\(=1\)
Dấu . là dấu nhân chú ý ạ.

Answer 2

\(a,\dfrac{4\times5\times6}{12\times15\times9}=\dfrac{4\times5\times2\times3}{4\times3\times3\times5\times9}=\dfrac{2}{3\times9}=\dfrac{2}{27}\\ b,\dfrac{6\times8\times11}{33\times16}=\dfrac{2\times3\times4\times2\times11}{11\times3\times4\times4}=\dfrac{2\times2}{4}=\dfrac{4}{4}=1\)

Answer 3

\(a,\dfrac{4\times5\times6}{12\times15\times9}=\dfrac{4\times5\times3\times2}{4\times3\times5\times3\times3\times3}=\dfrac{2}{27}\\ b,\dfrac{6\times8\times11}{33\times16}=\dfrac{2\times3\times8\times11}{3\times11\times2\times8}=1\)

Answer 4

thank you mng