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.