№ 940.
а)(3/4-1/3):5/7/
(1/4+2/3)*6/11
б)3/20*(7/12-1/2)+79/80/
13/24:(7/12+1/2)-1/4
в)(3+7/11)*1/4-1/22/
(5-3/11):13+1/2

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