18*3 = (10*3) + (8*3) = 30+24=54 (10+8) вычисли таким же способом 18*2 =; 13*4 =; 16*5=; 13*2 =; 17*3=; 17*5=

18*2 = (10*2) + (8*2) = 20+16=36

13*4 = (10*4) + (3*4) = 40+12=52

16*-5 = (10*5) + (6*5) = 50+30=80

13*2 = (10*2) + (3*2) = 20+6=26

17*3 = (10*3) + (7*3) = 30+21=51

17*5 = (10*5) + (7*5) = 50+35=85