Question

Làm cho em câu 1

Answer 1

hơi mờ

Answer 2

\(\dfrac{20}{-140}=\dfrac{20:\left(-20\right)}{\left(-140\right):\left(-20\right)}=\dfrac{-1}{7}\)

\(\dfrac{125.169.7}{13^2.25.14}=\dfrac{5.25.13^2.7}{13^2.25.2.7}=\dfrac{5}{2}\)

Answer 3

ý a= âm1 phần 7

ý b= 5 phần 26

Answer 4

1.

a) 20/-140=-20/140=-20:20/140:20=-1/7

b) 125.169.7/13².25.14=5.25.13².7/13².25.2.7=5/2

Answer 5

a,\(\dfrac{20}{17}=\dfrac{1}{7}\)

b,\(\dfrac{125.169.7}{13^2.25.14}=\dfrac{125.169.7}{169.25.14}=\dfrac{5}{2}\)  chỗ này là rút gọn nha

tick nha

Answer 6

Câu 1: 

a)  20/-140 = -20/140 = -20:20/140:20 = -1/7

b) 125.169.7/13².25.14 = 5.25.13².7/13².25.2.7 = 5/2