2.005×390+20.05×41+200.5×2=_.
问题描述:
2.005×390+20.05×41+200.5×2=______.
答
2.005×390+20.05×41+200.5×2
=20.05×39+20.05×41+20.05×20
=20.05×(39+41+20)
=20.05×100
=2005.