问题 解答题
用简便方法计算下列各题.
295+137+163186+(14+179)563-(163+179)756-159-241398-298-47.
答案

(1)295+137+163

=295+(137+163)

=295+300

=595

(2)186+(14+179)

=186+14+179

=200+179

=379

(3)563-(163+179)

=563-163-179

=400-179

=221

(4)756-159-241

=756-(159+241)

=756-400

=356

(5)398-298-47

=100-47

=53

单项选择题
单项选择题