Question

Номер : 1,2 пожалуйста

Answer 1

1. 5х³-4х+18+7х³+3х²-3 = 12х³+3х²-4х+15
    5х³-4х+18-7х³-3х²+3 = -2х³-3х²-4х+21

2. 4х⁵-4х²;  а²+8а-4а+32 = а²+4а+32

3. (х+18)/4  - (4х-3)/3 = 7
     3(х+18) -4(4х-3) = 12*7
     3х+54 -16х +12 = 84
     -13 х = 84-54-12
     -13х   = 18
       х = -18/13

4. (1/3 -9)(1/3+1) - (1/3 + 8)(1/3 +3) = -23 целых 25/27 
     а. 1/3-9 = (1-27)/9 = 26/9       г. 1/3+8 = (1+24)/3 = 25/3
     б.  1/3+3 = (1+3)/3 = 4/3         д.  1/3+3 = (1+9)/3 = 10/3
     в.  26*4/9*3 = 104/27             е.  25*10/3*3 = 250/9
    ж. 104/27 - 250/9 = 104 -750/27 = - 646/27 =