вычислите используя законы сложения
1/5+8/25+7/25=
1/7+2/21+3/7=
1/15+2/45+7/15=
3/49+5/7+4/49=
7/10+2/15+11/30=1/12+1/18+1/12 ПЛИЗ СРОЧНО ПОМОГИТЕ!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

1/5+8/25+7/25=5/25+8/25+7/25=20/25=4/51/7+2/21+3/7=3/21+2/21+6/21=11/211/15+2/45+7/15=3/45+2/45+21/45=26/453/49+5/7+4/49=3/49+35/49+4/49=42/49=6/77/10+2/15+11/30=21/30+4/30+11/30=36/30=12/10=6/51/12+1/18+1/12=18/216+12/216+18/216=48/216=6/27