用你认为简便的方法计算.12?617?1117 35?79 0.4 34 27 14?27.
(1)12-617-1117
=12-(617 1117),
=12-1,
=11;
(2)35-79 0.4,
=35 25-79,
=1-79,
=29;
(3)34 27 14-27,
=(34 14) (27-27),
=1 0,
=1.
0
(1)12-617-1117
=12-(617 1117),
=12-1,
=11;
(2)35-79 0.4,
=35 25-79,
=1-79,
=29;
(3)34 27 14-27,
=(34 14) (27-27),
=1 0,
=1.