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