问题
解答题
用简便方法计算
(1)101×301-301
(2)1876-(432+876)
(3)420÷28
(4)858×38+63×858-858.
答案
(1)101×301-301
=(101-1)×301
=100×301
=30100;
(2)1876-(432+876)
=1876-876-432
=1000-432
=568;
(3)420÷28
=420÷(7×4)
=420÷7÷4
=60÷4
=15;
(4)858×38+63×858-858
=858×(38+63-1)
=858×100
=85800.