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16x^4 y²
b)
30x^5 *(-y)³ = -30 x^5 y³
Drugie zad.;
-x² +5x² -x-3x+2x-x+3x=4x²-5x
12ak²+5ak²-4a²k-2a²k-6a²k²+8ak=
-6a²k²+17ak²-6a²k+8ak
b)
10*5*2 * (x² * x * x³ ) * y * y³ * y³ =100x^6y^7
42÷(-7)*(k³ -k^1) * *(m^5 -m^4 =- 6k² m