问题 解答题

用简便方法计算下面各题:

1997+1998+1999+20013425-188-212-25

567×999+567×2(91×48×75)÷(25×13×16)

答案

(1)1997+1998+1999+2001

=(2000-3)+(2000-2)+(2000-1)+(2000+1)

=2000×4-5

=7995;

(2)3425-188-212-25

=3425-(188+212)-25

=3425-400-25

=3000;

(3)567×999+567×2

=567×(999+2)

=567×(1000+1)

=567×1000+567

=567000+567

=567567;

(4)(91×48×75)÷(25×13×16)

=(63×25×13×16)÷(25×13×16)

=63×(25×13×16)÷(25×13×16)

=63;

故答案为7995;3000;567567;63.

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