∠1=х; ∠2=5х/21.
∠1+∠2=180°,
х+5х/21=180,
х=145 целых и 5/13; ∠1=1890/13 °.
∠2=180-1890/13=34 целых и 8/13 °
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∠1=х; ∠2=5х/21.
∠1+∠2=180°,
х+5х/21=180,
х=145 целых и 5/13; ∠1=1890/13 °.
∠2=180-1890/13=34 целых и 8/13 °