А) (1) -3 1/5+ 2 3/4= -3 4/20+ 2 15/20= -2 24/20+2 15/20= 9/20
(2)9/20*(-2 6/7)= -9/7=1 2/7
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А) (1) -3 1/5+ 2 3/4= -3 4/20+ 2 15/20= -2 24/20+2 15/20= 9/20
(2)9/20*(-2 6/7)= -9/7=1 2/7