Вычислите
1) 1/4+5/6;2/3+1/5;1/6+3/8;5/12+7/18
2)4/15+3/25;9/16+5/24;19/32+17/48;41/45+43/50
3) 5/9+1/12;3/7+4/21;4/35+4/21+3/5+1/9
4) 1/9+4/15;5/12+1/12+5/18+7/12+1/4+7/18
(помогите срочно )
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