Question

Tính:

a, \(\frac{-28}{19}.\frac{\left(-38\right)}{14}\)

b, \(\frac{-21}{16}.\frac{\left(-24\right)}{7}\)

c, \(\frac{12}{17}.\frac{\left(-34\right)}{9}\)

d, \(\frac{\left(-15\right)}{4}:\frac{21}{10}\)

e,\(-2\frac{1}{7} :-1\frac{1}{14}\)

Answer 1

a) \(\frac{-28}{19}\). \(\frac{\left(-38\right)}{14}\)= 4

b) \(\frac{-21}{16}\). \(\frac{\left(-24\right)}{7}\)= \(\frac{9}{2}\)

c) \(\frac{12}{17}\). \(\frac{\left(-34\right)}{9}\)= \(\frac{-8}{3}\)

d) \(\frac{\left(-15\right)}{4}\): \(\frac{21}{10}\)= \(\frac{-25}{14}\)

e) \(-2\frac{1}{7}\): \(-1\frac{1}{14}\)= 2

nhớ ủng hộ mik nha mn

Answer 2

a.=4

b.=119/24

c.= -8/3

d.= -25/14

Mình chỉ làm đc từng này thôi

Answer 3

\(a,\frac{-28}{19}.\frac{\left(-38\right)}{14}\)

\(=\frac{-28.\left(-38\right)}{19.14}\)

\(=\frac{-2.\left(-2\right)}{1.1}\)

\(=-2.\left(-2\right)=4\)

\(b,\frac{-21}{16}.\frac{\left(-24\right)}{7}\)

\(=\frac{-21.\left(-24\right)}{16.7}\)

\(=\frac{-3.\left(-3\right)}{2.1}\)

\(=\frac{9}{2}\)

\(c,\frac{12}{17}.\frac{\left(-34\right)}{9}\)

\(=\frac{12.\left(-34\right)}{17.9}\)

\(=\frac{4.\left(-2\right)}{1.3}\)

\(=\frac{-8}{3}\)

\(d,\frac{\left(-15\right)}{4}:\frac{21}{10}\)

\(=\frac{\left(-15\right)}{4}.\frac{10}{21}\)

\(=\frac{\left(-5\right).5}{2.7}\)

\(=\frac{-25}{14}\)

\(e,-2\frac{1}{7}:\left(-1\frac{1}{14}\right)\)

\(=\frac{-15}{7}:\frac{-15}{14}\)

\(=\frac{-15}{7}.\frac{14}{-15}\)

\(=\frac{1.2}{1.1}\)

\(=2\)

                                 Cảm ơn mình bằng 1 dấu tích đúng nha \(!!!\)

Answer 4

a) \(\left(-\frac{28}{19}\right)\cdot\left(-\frac{38}{14}\right)=4\)

b) \(\left(-\frac{21}{16}\right)\cdot\left(-\frac{24}{7}\right)=4\frac{1}{2}\)

c) \(\frac{12}{17}\cdot\left(-\frac{34}{9}\right)=-2\frac{2}{3}\)

d) \(\left(-\frac{15}{4}\right):\frac{21}{10}=-1\frac{11}{14}\)

e) \(\left(-2\frac{1}{7}\right):\left(-1\frac{1}{14}\right)=2\)