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find the greatest common factor.

1.6x²y - 18xy²
2.9x³y² + 24x⁴y³
3.4x⁶+8x⁸ - 16¹⁰
4.x⁴⁰ - x⁴⁵
5.18x⁵y⁴ + 30x³y² - 42x²y​