(-2,5+2 1\3) х (-5 1\7)+(-3,5)=

(-2,5+2 1\3) х (-5 1\7)+(-3,5)=-2 9/141) -2,5+2 1\3=-2 5/10+2 1/3=-25/10+7/3=-75+70=-5/30=-1/6 30 2) -1/6*(-5 1/7)=1/6*36/7=6/73) 6/7+(-3,5)=6/7-3 5/10=6/7-35/10=60-245=-185/70=-37/14=-2 9/14 70