A-A+
计算下列各题 能简算的要简算.(1)45+(38-14)(2)2-37-47 (3)58-1
问题详情
计算下列各题,能简算的要简算.
(1)
(2)2-
(3)
(4)38.7-7.84÷1.4
(5)
(6)8.8-2.5×1.8.
参考答案
(1)45+(38-14),
=45+(38-28),
=45+18,
=3240+540,
=3740;
(2)2-37-47,
=2-(37+47),
=2-1,
=1;
(3)58-13+512,
=1524-824+1024,
=724+1024,
=1724;
(4)38.7-7.84÷1.4,
=38.7-5.6,
=33.1;
(5)512-(112-12),
=512-(112-612),
=512-(-512),
=512+512,
=1012,
=56;
(6)8.8-2.5×1.8,
=8.8-4.5,
=4.3.
考点: