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x^8:x^7+x^6:x^5-x^4:x^3+x^2:x


Răspuns :

x⁸:x⁷+x⁶:x⁵-x⁴:x³+x²:x=
=x+x-x+x=2x
x^8 : x^7 +x^6 :x^5 - x^4 : x^3 +x^2 :x=
x^8-7 + x^6-5 - x^4-3 + x^2-1=
x+x-x+x=2x