39x37-13x18【运用因式分解计算
问题描述:
39x37-13x18【运用因式分解计算
答
解39x37-13x18
=13×3x37-13x18
=13×(3x37-18)
=13×(111-18)
=13×99
=13×(100-1)
=1300-13
=1287