Выполните действия :1)(2/7+5/21):1 4/7 ; 2)(8/11+3/22):5/11; 3) 1 7/12:(3/8+5/12); 4) 17/36:(7/12-5/9); 5) (3/14 +5/7):3 5/7; 6) 19/24 : (3/16+5/24). СРОЧНОООООО
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1)(2/7+5/21):1 4/7 ;2/7+5/21=6/21+5/21=11/21
11/21:1 4/7=11/21×7/11=1/3
2)(8/11+3/22):5/11
8/11+3/22=16/22+3/22=19/22
19/22:5/11=19/22×11/5=19/10=1 9/10
3) 1 7/12:(3/8+5/12);
3/8+5/12=9/24+10/24=19/24
1 7/12:19/24=19/12×24/19=2
4) 17/36:(7/12-5/9);
7/12-5/9=21/36-20/36=1/36
17/36:1/36=17/36×36/1=17
5) (3/14 +5/7):3 5/7;
3/14+5/7=3/14+10/14=13/14
13/14:3 5/7=13/14×7/26=1/4
6) 19/24 : (3/16+5/24)
3/16+5/24=9/48+10/48=19/48
19/24×48/19=2