вычислите применяя законы умножения:1) -3/7*5/13-4/7*5/13 = 2) -3/5*7/11-2/5*7/11= 3) 3\5*7\9-3\5*(7/9-5\6)= 4) 3/4*7\8-3/4*(7/8-2/3)=
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2) (-3/5-2/5)х7/11=-1х7/11=-7/11
3) 3/5х(7/9-7/9+5/6)=3/5х5/6=1/2
4) 3/4(7/8-7/8+2/3)=1/2