в) (53²-27²):(79²-51²)= ((53-27)(53+27)):((79-51)(79+51))= (26*80):(28*130)=(26*8):(28*13)= (2*8):28=16:28=4/7
г) (53²-32²):(61²-44²)= ((53-32)(53+32)):((61-44)(61+44))=(21*85):(17*105)=(21*5):105=105:105=1
д) (12²-26²):(16²-54²)= ((12-26)(12+26)):((16-54)(16+54))=(-14*38):(-38*70)=14:70=1/5=0,2
е) (27²-63²):(79²-83²)= ((27-63)(27+63)):((79-83)(79+83))=(-36*90):(-4*162)=(9*90):162=5
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в) (53²-27²):(79²-51²)= ((53-27)(53+27)):((79-51)(79+51))= (26*80):(28*130)=(26*8):(28*13)= (2*8):28=16:28=4/7
г) (53²-32²):(61²-44²)= ((53-32)(53+32)):((61-44)(61+44))=(21*85):(17*105)=(21*5):105=105:105=1
д) (12²-26²):(16²-54²)= ((12-26)(12+26)):((16-54)(16+54))=(-14*38):(-38*70)=14:70=1/5=0,2
е) (27²-63²):(79²-83²)= ((27-63)(27+63)):((79-83)(79+83))=(-36*90):(-4*162)=(9*90):162=5