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1 5 10 10 5 1 <== pangkat 5
(2x + 5y)^5 = 1(2x)^5 + 5(2x)^4.(5y)^1 + 10(2x)^3.(5y)^2 + 10(2x)^2.(5y)^3 + 5(2x)^1.(5y)^4 + 1(5y)^5
=32x^5 +5(16x^4).(5y) + 10(8x^3)(25y^2) + 10(4x^2)(125y^3) + 5(2x)(625y^4) + 3125y^5
=...... itung sndiri