Jawabanmu

Jawaban paling cerdas!
2014-08-21T17:39:47+07:00
A. x(3x²+xy+2y²)+y( 3x²+xy+2y²)
= 3x³+x²y+2xy²+3x²y+xy²+2y³
b. 3k(k²-2k-6)-5( k²-2k-6)
= 3k³-6k²-18k-5k²+10k+30
= 3k³-6k²-5k²-18k+10k-30
= 3k³-11k²-8k-30
c. a(a-b)+ab(a-b)+b(a-b)
= a²-ab+a²b-ab²+ab-b²
= a²-ab+ab+a²b-ab²-b²
= a²+a²b-ab²-b²
d. x²(x²-2x-1)+3x(x²-2x-1)-5(x²-2x-1)
= x⁴-2x³-x²+3x³-6x²-3x-5x²+10x+5
= x⁴-2x³+3x³-x²-6x²-5x²-3x+10x+5
= x⁴+x³-12x²+7x+5
e. a²b+2ab²-abc
f. 5x²y-15xy²+25xy
2 5 2