把下列各式的公因式写在横线上:①5x2-25x2y______; ②-4x2n-6x4n=______ (2+3x2n)
题型:填空题难度:一般来源:不详
把下列各式的公因式写在横线上: ①5x2-25x2y______; ②-4x2n-6x4n=______ (2+3x2n) |
答案
①∵5x2-25x2y=5x2•1-5x2•5y, ∴5x2-x2y的公因式是5x2; ②∵-4x2n-6x4n=-2x2n×2-2x2n•3x2n, ∴-4x2n-6x4n的公因式是-2x2n. 故答案为:①5x2;②-2x2n. |
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