Question

приведите подобные слагаемые1)8b+12b-21b+b2)-13c+12c+40c-18c3)-p-p-p-3p-p-p4)4.14a+8.73a+5.8-a

Answer 1

$\displaystyle 8b+12b-21b+b=b(8+12-21+1)=b(0)=0$

$\displaystyle -13c+12c+40c-18c=c(-13+12+40-18)=c(21)=21c$

$\displaystyle -p-p-p-3p-p-p=-p(1+1+1+3+1+1)=-p(8)= -8p$

$\displaystyle 4.14a+8.73a+5.8-a=a(4.14+8.73-1)+5.8=11.87a+5.8$

если в последнем примере потеряли букву, то

$\displaystyle 4,14a+8.73a+5.8a-a=a(4.14+8.73+5.8-1)=17.67a$

Answer 2

1) 8b + 12b - 21b + b = (8b + 12b - 21b + b) = 8b + 12b - 21b + b = (8 + 12 - 21 + 1)b = -1b

2) -13c + 12c + 40c - 18c = (-13c + 12c + 40c - 18c) = -13c + 12c + 40c - 18c = (-13 + 12 + 40 - 18)c = 21c

3) -p - p - p - 3p - p - p = (-p - p - p - 3p - p - p) = -p - p - p - 3p - p - p = (-1 - 1 - 1 - 3 - 1 - 1)p = -8p

4) 4.14a + 8.73a + 5.8 - a = (4.14a + 8.73a + 5.8 - a) = 4.14a + 8.73a + 5.8 - a = (4.14 + 8.73 - 1)a = 11.87a - a = 10.87a