Question

Tính :

a)\(\frac{-6}{35}.\frac{-49}{60}\)

b) \(\frac{-16}{25}.\frac{-5}{24}\)

c) \(\frac{15}{-17}.\frac{5}{18}\)

 

 

Answer 1

a) \(\frac{-6}{35}.\frac{-49}{60}=\frac{\left(-6\right).\left(-49\right)}{35.60}=\frac{\left(-6\right).\left(-7\right).\left(-7\right)}{\left(-5\right).\left(-7\right).\left(-6\right).\left(-10\right)}=\frac{-7}{\left(-5\right).\left(-10\right)}=\frac{-7}{50}\)

b) \(\frac{-16}{25}.\frac{-5}{24}=\frac{\left(-16\right).\left(-5\right)}{25.24}=\frac{\left(-8\right).2.\left(-5\right)}{\left(-5\right).\left(-5\right).\left(-8\right).\left(-3\right)}=\frac{2}{\left(-5\right).\left(-3\right)}=\frac{2}{15}\)

c) \(\frac{15}{-17}.\frac{5}{18}=\frac{15.5}{\left(-17\right).18}=\frac{5.3.5}{\left(-17\right).3.6}=\frac{5.5}{\left(-17\right).6}=\frac{25}{-102}\)

Answer 2

a) \(\frac{-6}{35}\cdot\frac{-49}{60}\)

\(=\frac{\left(-6\right)\cdot\left(-49\right)}{35\cdot60}\)

\(=\frac{294}{2100}=\frac{7}{50}\)

b)\(\frac{-16}{25}\cdot\frac{-5}{24}\)

\(=\frac{\left(-16\right)\cdot\left(-5\right)}{25\cdot24}\)

\(=\frac{80}{600}=\frac{2}{15}\)

c)\(\frac{15}{-17}\cdot\frac{5}{18}\)

\(=\frac{15\cdot5}{\left(-17\right)\cdot18}\)

\(=\frac{75}{-306}=\frac{25}{-102}\)

Answer 3

a, = 7/50

b, = 2/15

c, = -25/102

Tk mk nha

Answer 4

a) \(\frac{-6}{35}.\frac{-49}{60}=\frac{\left(-6\right).\left(-49\right)}{35.60}=\frac{294}{2100}=\frac{7}{50}\)

b) \(\frac{-16}{25}.\frac{-5}{24}=\frac{\left(-16\right).\left(-5\right)}{25.24}=\frac{80}{600}=\frac{2}{15}\)

c) \(\frac{15}{-17}.\frac{5}{18}\)= \(\frac{-15}{17}.\frac{5}{18}=\frac{\left(-15\right).5}{17.18}=\frac{-75}{306}=\frac{-25}{102}\)