2.005×390-20.05×41+200.5×2

来源：学生作业学帮网编辑：学帮网时间：2024/06/17 13:03:34

2.005×390-20.05×41+200.5×2
=20.05x39-20.05x41+20.05x20
=20.05x(39-41+20)
=20.05x18
=20.05x(10+8)
=20.05x10+20.05x8
=200.5+160.4
=360.9