A-A+
脱式计算(能简便的要用简便方法计算) (1)16+15+13(2)712+16-14(3)8
问题详情
脱式计算(能简便的要用简便方法计算)
参考答案
(1)16+15+13,
=1130+13,
=710;
(2)712+16-14,
=34+14,
=1;
(3)811+715-815,
=811-115,
=109165;
(4)7-(34-15),
=7-1120,
=6920;
(5)45-(415+13),
=45-915,
=15;
(6)47+521-47+221,
=(47-47)+(521+221),
=0+13,
=13.
考点:方法