Question

giúp mik 3,4

Answer 1

Bài 4:

a: \(\widehat{BAx}=180^0-70^0=110^0\)

Answer 2

 a)Ta có: \(\widehat{aMb}\) +\(\widehat{EMN}\)=180( 2 góc kề bù)⇔\(\widehat{aMb}\)=180-\(\widehat{EMN}\)=180-120=60

Mà \(\widehat{aMb}\)=\(\widehat{MN}F\)=60( 2 góc SLT) =>a//b

b)Vì a//b nên \(\widehat{x}\)=\(\widehat{NFE}\)=90 (2 góc SLT )