Ответ:
/_B=x
/_A=x-30°
/_C=x+20°
/_A-?/_B-?/_C-?
/_A+/_B+/_C=180°
x-30°+x+x+20°=180°
3x=180°+10°
x=190/3
x=63°20'/_B
/_A=33°20'
/_C=83°20'
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Ответ:
/_B=x
/_A=x-30°
/_C=x+20°
/_A-?/_B-?/_C-?
/_A+/_B+/_C=180°
x-30°+x+x+20°=180°
3x=180°+10°
x=190/3
x=63°20'/_B
/_A=33°20'
/_C=83°20'