решите:

x-7/8=11/12

19/20-x=9/12

7-y=3целых1/3

x-7/8=11/12х=11/12+7/8

х=22/24+21/24

х=43/24

х=1 19/24

19/20-x=9/12х=19/20-9/12

х=57/60-45/60

х=12/60

х=1/5

7-y=3целых1/3

у=7  -3  1/3

у=7/1 -10/3

у=21/3-10/3

у=11/3

у=3  2/3

x-7/8=11/12

х= 11/12+7/8

х= 1  19/24

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1  19/24-7/8=11/12

19/20-x=9/12

х= 19/20-9/12

х=1/5

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19/20-1/5=9/12

7-y=3  1/3

у= 7-3  1/3

у= 3  2/3

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7 - 3  2/3= 3  1/3