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1 1-----------> 1
1 2 1---------> 2
1 3 3 1--------> 3
1 4 6 4 1-------> 4
caranya :
karena pangkat 3 kita pake segitiga pascal yang no. 3, jadi :
1 + 3 +3 +1
1(2x)³ + 3(2x)² + (2x) +1
1(2x)³ + 3(2x)²(-y) + (2x)(-y)² + (-y)³
8x³ - 12x²y + 6xy² - y³
ini gambar segitiga pascal