Ответ:
1) 3а/10 + 2а/10 = 5а/10 = 1а/2
2) 6х/5у - х/5у = 7х/5у
3) 2m-4n/21c + 5m+18n/21c = 2m+5m+18n-4n/21c = 7m+14n/21c = 7m+2n/3c
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Ответ:
1) 3а/10 + 2а/10 = 5а/10 = 1а/2
2) 6х/5у - х/5у = 7х/5у
3) 2m-4n/21c + 5m+18n/21c = 2m+5m+18n-4n/21c = 7m+14n/21c = 7m+2n/3c