Oblicz stosując odpowiednie wzory skrucomego mnożenia
a) (x-3y)³
b) (ax+y)³
c) (-ax-by)³
d) (-2x+4)³
Oblicz stosując odpowiednie wzory skruconego mnożenia.
a) (x-2)(x²+2x+4)
b) (5+y)(25-5y+y²
c) (-x-5)(x²-5x+25)
d) (a³x-b²y)(a⁶x²+a³b²xy+b⁶y²)
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1. a)=x³+9x²y+27xy²+27y³
b)=a³x³+3a²x²y+3axy²+y³
c)=-(a³x³+3a²x²by+3axb²y²+b³y³)
d)=64-96x+48x²-8x³
2.a)=x³-8
b)=125-y³
c)=-(x³+125)³
d)= a^9x³-b^6y³
a)
(x-3y)³=x³-3·x²·3y+3·x·(3y)²-(3y)³=x³-9x²y+27xy²-27y³
b)
(ax+y)³ =a³x³+3·a²x²·y+3·ax·y²+y³=a³x³+3a²x²y+3axy²+y³
c)
(-ax-by)³ =-a³x³- 3·-a²x²·by +3·-ax·b²y² -b³y³= -a³x³+3a²x²by-3axb²y²-b³y³
d)
(-2x+4)³ =-8x³+3·4x²·4+ 3·-2x·16+64=-8x³+48x²- 96x+64
Zad2
a)
(x-2)(x²+2x+4) =x³-2³=x³-8
b)
(5+y)(25-5y+y²)=5³+y³=125+y³
c)
(-x-5)(x²-5x+25)=-x³-5³=-x³-125
d)
(a³x-b²y)(a⁶x²+a³b²xy+b⁶y²) =(a³x)³ -(b²y)³=a⁹x³-b⁶y³