Odpowiedź:
Zapis x^2 oznacza x do kwadratu jakby co ;)
5
a. 10a-7a+b-3b=3a-2b
3 * (-2) - 2 * 3= -6 - 6 = -12
b. a+3b+2a-2b=3a+b
3 * 2 + (-3) = 6 - 3 = 3
c. 2a-4a+6b-8b-a=-3a-2b
-3 * 5 -2 * (-1/2) = -15 + 1 = -14
d. a-3b-a+3b-a+3b=-a+3b
- (-3) + 3 * 1 = 3 + 3 = 6
f. -x^2+4+2x^2+9=x^2+13
(-1)^2 + 13 = 1 + 13 = 14
g. 4x^2+4+5x^2+9=9x^2+13
9 * 2^2 + 13 = 9 * 4 + 13 = 36 + 13 = 49
6
a. 7x+2y-3x-2y+5=4x+5
4*(-2)+5=-8+5=-3
b. -x+y-3x+2y=-4x+3y
-4*(-2)+3*1=8+3=11
c. 5y-2+x+3y-2x+5=8y-x+3
8*1-(-2)+3=8+2+3=13
d. -3x^2-2y-2+4x^2-3y+1=x^2-5y-1
(-2)^2-5*1-1=4-5-1=-2
f. 2x+3-3x+9=-x+12
-(-2)+12=14
g. -x-4y-x+5y=-2x+y
-2*(-2)+1=4+1=5
