问题
解答题
2.005×390-20.05×41+200.5×0.2.
答案
2.005×390-20.05×41+200.5×0.2,
=20.05×39-20.05×41+20.05×2,
=20.05×(39+2-41),
=0.
2.005×390-20.05×41+200.5×0.2.
2.005×390-20.05×41+200.5×0.2,
=20.05×39-20.05×41+20.05×2,
=20.05×(39+2-41),
=0.