1.Oblicz wartości wyrażeń algebraicznych:
A) 3x+4 dla x=-2
B) -8-2y dla y=3
C) 2x+3y-6 dla x=4 i y=-3
2.Zapisz w prostszej postaci :
A)-5x+2x+6x=?
B) -4(3x+jedna czwarta)+7x=?
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zad.1
a)
3x+4 = ? x = -2
3*(-2) + 4 = -6+4 = -2
a)
-8 – 2y = ? y = 3
-8 – 2 *3 = - 8 – 6 = -14
c)
2x+3y – 6 = ? x = 4 i y = -3
2*4 + 3 *(-3) – 6 = 8 – 9 - 6 = -7
zad. 2
a)
-5x + 2x + 6x = -5x+8x = 3x
b)
-4(3x+ 1/4)+7x = -12x – 1 + 7x = -5x -1