6.9×7.99+0.69×20.1简便方法
问题描述:
6.9×7.99+0.69×20.1简便方法
答
6.9×7.99+0.69×20.1
=6.9×7.99+6.9×2.01
=6.9x(7.99+2.01)
=6.9x10
=69