Question

 упростить выражение 19*42-42*16+16*40-40*13+13*38-38*10+10*36-36*7

Answer 1

42(19-16)+40(16-13)+38(13-10)+36(10-7)

Answer 2

19*42-42*16+16*40-40*13+13*38-38*10+ 10*36-36*7 == 42*(19-16) + 40*(16-13) + 38*(13-10) + 36*(10-7) = 42*3 + 40* 3 + 38*3 + 36*3 =
= 3 * (42+40+38+36)= 3*156 = 468