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7. 144x^4y²z² / 16 x²y^4 = 9x²z² / y² = 9x²z²y^-2
9. dfaktorkan dulu semua > (2x+1)(x-3) / (x-3)(x-3) = (2x+1) / (x-3)
10. a=(4x-3y) , t = 2/3(4x-3y)
l.segitiga = 1/2 a.t
1/2 (4x-3y). 2/3(4x-3y) = 16/3x² -8xy +3y²