1. а)4.6 х (-2.5) = -11.5
б) -3.7 х (-0.6) = 2.22
в)-1 1/7 x 1 5/16 = - 1 1/2
2. -8.6 x 4 - 14 (-1.3) + (-4.3)(-8)= -34.4 + 18.2 + 34.4 = 18.2
3. 1/3 x + 1/7 y - 1/7 x + 1/2 y = 2x+3y/6 + y-x/7 = 14x+21y+6y-6x/ 42 = 8x + 27y / 42
4. 0.4 ( 3m - 5a ) - 0.5 ( 7m - 4a ) = 1.2m - 2a - 3.5m + 2a = -2.3 m