2/11(х+у) при х=-13, у=2,   -0.8ху при х=-10,у=-0.5   -3/4Х(х-у) при х=5,у=13.       (-4/5)Х(-3/8)Х(5/12) (-9/10)Х5/6Х(-2/3)     -63Х(7-11) 9.9Х(3-5) -2.2Х(8-3) (26-11)Х(-0.4) (32-40)Х3.5 (0.99-1)Х26

  2/11(х+у)=2/11(-13+2)=2/11*(-11)=-2 -0,8ху=-0,8*(-10)*(-0,5)=8*(-0,5)=-4 -3/4*(х-у)=-3/4*(5-13)=-3/4*(-8)=6      (-4/5)*(-3/8)*(5/12)=3/10*5/12=1/12 (-9/10)*5/6*(-2/3)=(-3/4)*(-2/3)=1/2      -63*(7-11)=-63*(-4)=252 9,9*(3-5)=9,9*(-2)=-19,8 -2,2*(8-3)=-2,2*5=-11 (26-11)*(-0,4)=15*(-0,4)=-6 (32-40)*3,5=-8*3,5=-28 (0,99-1)*26=-0,01*26=-0,26