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a) x²+x-1 [dla x= -1]
(-1)²+(-1)-1 = 1-1-1 = -1
b) 2(-x+4) [dla x= -10]
2(-(-10)+4) = 2*14 = 28
c) 1-y+x [dla x= 2 i y= -1]
1-(-1)+2 = 1+1+2 = 4
zad.2. Uporządkuj jednomiany:
a) 4a*5b = 20ab
b) -3x*1/3x = -x²
c) -x*(-2x) = 2x²
d) 1/2y*3t*2y = 3ty²
e) -xy*(-xy) = x²y²
f) -3ab*(-6b) = 18ab²
zad.3. Zredukuj wyrazy podobne:
a) -4x-7-3x+7 = -7x
b) x-2xy+1/2x-1/3xy = 1½x-2⅓xy
c) -x²+y²-2x²-2y² = -3x²-y²
d) -x²+2x-3x+x² = -x
e) 4x+4-7x-1/2 = -3x+3½
f) -2ab+12a-4ab-16a = -4a-6ab