Question

[dưq ừnk]

a)12 . 25 = 15 .20

b)3.(-24) = 6.(-12)

c)2,5.3,5 = 7.1,25

Answer 1

[Nguyễn Lê Phước Thịnh]

a: \(12\cdot25=15\cdot20\)

=>\(\dfrac{12}{15}=\dfrac{20}{25};\dfrac{12}{20}=\dfrac{15}{25};\dfrac{15}{12}=\dfrac{25}{20};\dfrac{20}{12}=\dfrac{25}{15}\)

b: \(3\cdot\left(-24\right)=6\cdot\left(-12\right)\)

=>\(\dfrac{3}{6}=\dfrac{-12}{-24};\dfrac{3}{-12}=\dfrac{6}{-24};\dfrac{6}{3}=\dfrac{-24}{-12};\dfrac{-12}{3}=\dfrac{-24}{6}\)

c: \(2,5\cdot3,5=7\cdot1,25\)

=>\(\dfrac{2.5}{7}=\dfrac{1.25}{3.5};\dfrac{2.5}{1.25}=\dfrac{7}{3.5};\dfrac{7}{2.5}=\dfrac{3.5}{1.25};\dfrac{1.25}{2.5}=\dfrac{3.5}{7}\)