Объяснение:
1х+2х+3х=180
6х=180
х=30
а=30•1=30
б=30•2=60
с=30•3=90
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Объяснение:
1х+2х+3х=180
6х=180
х=30
а=30•1=30
б=30•2=60
с=30•3=90