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.

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