1. tính : 68mod 5+4 99 div 11-3 2. ax^2+bx+2c 2x+y/5-x^2+y (x-y)/(2*x) ((1+x)*(1+x))/2

1. Tính:

a. (68 mod 5) + 4 `= 3 + 4 = 7`

b. (99 div 11) – 3 `= 9 – 3 = 6`

2. 

`ax^2 + bx +2c` → a*x*x+b*x+2*c

`2x+y/5-x^2+y` → 2*x+y/5-x*x+y

(x-y)/(2*x) → `{x-y}/{2x}`

((1+x)*(1+x))/2 → `{(1+x)^2}/2`