问题 解答题

计算下面各题,怎样简便就怎样算.

63.4+5.9+35.6

7.25-(1.25+3.4)

470-128-272

405÷15×(198-184)

125×7×88

234×67+166×67.

答案

(1)63.4+5.9+35.6,

=(63.4+35.6)+5.9,

=99+5.9,

=104.9;

(2)7.25-(1.25+3.4),

=7.25-1.25-3.4,

=6-3.4,

=2.6;

(3)470-128-272,

=470-(128+272),

=470-400,

=70;

(4)405÷15×(198-184),

=405÷15×14,

=27×14,

=378;

(5)125×7×88,

=125×7×8×11,

=(125×8)×(7×11),

=1000×77,

=77000;

(6)234×67+166×67,

=(234+166)×67,

=400×67,

=26800.

单项选择题
单项选择题