A

B

đang thi?

C

Lỗi?

Khí clo: Cl₂

Phân tử khối: 35,5.2 = 71 (đvC)

Axit cacbonic: H₂CO₃

Phân tử khối: 2.1 + 12 + 16.3 = 62 (đvC)

\(c)\dfrac{-3}{-10}=\dfrac{-6}{-20}=\dfrac{6}{20}\\\dfrac{-7}{-20}=\dfrac{7}{20}\\Do\ 6 < 7 nên\ \dfrac{6}{20}<\dfrac{7}{20}\\->\dfrac{-3}{-10}<\dfrac{-7}{-20}\\d)\dfrac{-5}{4}=\dfrac{-25}{20} \\\dfrac{23}{-20}=\dfrac{-23}{20}\)

\(Do\ -25<-23\ nên\ \dfrac{-25}{20}<\dfrac{-23}{20} \\->\dfrac{-5}{4}<\dfrac{23}{-20}\)

Lỗi

lỗi