Реши уровнения. 1)72/20-(х-12/20)=15/80 2)116/125- (41/125-х)=94/125
3) 4/40 + у+16/40=31/40+6/40
4)60/90-(6/90+х)=29/90
3) 4/40 + у+16/40=31/40+6/40
4)60/90-(6/90+х)=29/90
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