А)
3*а +7*а = (3+7) * а= 10 * а =10a
16*m - 7*m = (16-7) *m = 9*m =9m
9*n + n = 9*n + 1*n = (9+1) *n = 10 *n =10n
б)
6*х - 2*х = (6-2)*х = 4 *х =4x
8*b + 9 *b = (8+9)*b = 17 *b =17b
13*k - k = 13*k - 1*k = (13-1) *k = 12*k =12k
в)
17 *m + 7 * m = (17+7) * m = 24 *m =24m
10 * x - 3*x = (10-3) * x = 7 *x =7x
4*t + t = 4*t + 1*t = (4+1) * t = 5 *t =5t
г)
10*а + 10*b = 10 *(a+b)
10*a + 7a = 10*a + 7*a = (10+7)*a = 17*a=17a
10 *a - 7a = 10*a - 7*a = (10-7) *a = 3*a =3a