Question

cho tam giac ABC co A=2B, C=3/2B tính số đo mỗi góc

Answer 1

Ta có A=2B=>B=A/2

        C=3/2B=>B=2/3C=C/3/2

=>A/2=B=C/3/2     Mà A+B+C=180⁰

Áp dụng t/c...,ta có:

A/2=B/1=C/3/2=A+B+C/2+1+3/2=180⁰/9/2=40⁰

+)A/2=40⁰=>A=80⁰

+)B/1=40⁰=>B=40⁰

+)C/3/2=40⁰=>C=60⁰

Vậy A=80⁰

      B=40⁰

      C=60⁰