Răspuns:
Explicație pas cu pas:
a = -3/2; b = 1/6; c = -2/9
a(b - c) = -3/2 [(1/6 - (-2/9)] = -3/2(1/6 + 2/9) = -3/2 (3/18 + 4/18) = -3/2*7/18 = -7/12
ab - ac = -3/2*1/6 - (-3/2)*(-2/9) = -3/12 - 1/3 = -3/12 - 4/12 = -7/12
__________
a = -7/4; b = -1/21; c= -3/28
a(b - c) = -7/4 [(-1/21 - (-3/28)] = -7/4(-1/21 + 3/28) = -7/4(-4/84 + 9/84) = -7/4*5/84 = -5/48
ab - ac = -7/4*(-1/21) - (-7/4)(-3/28) = 1/12 - 3/16 = 4/48 - 9/48 = -5/48
