Question

15a-3ay-4y+20 rs-6r-5s+30挑出最大公因子,求详解

Answer 1

第一道题：

15a-3ay-4y+20 = (5a-3ay) + (20 - 4y) = 3a(5 - y) + 4(5 - y) = (5 - y) (3a + 4)

第二道题：

rs - 6r - 5s + 30 = (rs - 6r) - (5s - 30) = r(s - 6) - 5(s - 6) = (s-6) (r-5)