2\7*(-5 1\4) -4 1\2*(-1 1\3)
2/7 *( - 5 1/4 )= 2/7 * (-21/4) = -42/28= - 3/2 = - 1 целая 1/2
-4 1/2 *( - 1 1/3) = -9/2 * (-4/3) = 36/6 = 6