Odpowiedź:
Zadanie 1.
a) m+n
b) (a+9)²
Zadanie 2
a) iloraz liczb w i 4
b) iloczyn liczb 3-x i 5+y
iloczyn liczb różnicy 3 i x i sumy 5 i y
Zadanie 3
a) x = -1
-4x - 5 = -4 × -1 -5= 4 -5 = -1
b) x = 2 y = 3
5x - x² - (3 - 2y) = 5 × 2 - 2² - (3 - 2 × 3) = 10 - 2×2 - (3 -2 × 3) = 10 - 4 - (3 - 2 × 3 ) = 14 - ( 3 - 2 × 3 ) = 14 - (3 - 6 ) = 14 - ( -3) = 14 + 3 = 17
Zadanie 4
a) 5a² -6a -6 -5a -2a²= 5a² -2a² -6a -5a -6 = 3a² -11a -6
b) xy +4x + 4y +3xy -7y = xy + 3xy + 4x +4y - 7y = 4xy +4x -3y
c) 2a - (3a -2b ) + (a + b ) = 2a × -3a + 2a × -2b + a + b = -6a² - 4ab + a + b
d) -2 (5 - u ) + 4 ( 3 u -2)= -2 × 5 -2 × - u + 4 × 3u + 4 × -2 = -10 + 2u + 12 u - 8 = -10 -8 + 2u + 12u = -18 +14u
e)(2a - 5) ( a + 4)= 2a × a + 2a × 4 - 5 × a - 5 × 4 = 2a² + 8a -5a -20 = 2a² +3a - 20
Zadanie 5
2y + 4 + y -1 + 2y + 4 + 2y + 4 + y -1 + 5x +2 + 5x +2= 2y + y + 2y + 2y + y + 5x + 5x + 4 - 1 +4 -1 +2 +2= 8y + 10x + 10
