A-A+
计算下列各题 能简算的要简算.(1)25+13+35(2)34-15-38(3)79+15-
问题详情
(1)
参考答案
(1)25+13+35,
=(25+35)+13,
=1+13,
=113;
(2)34-15-38,
=3040-840-1540,
=2240-1540,
=740;
(3)79+15-(15+59),
=79+15-15-59,
=(79-59)+(15-15),
=29+0,
=29;
(4)23+(12-14),
=23+(24-14),
=23+14,
=812+312,
=1112;
(5)1-817-917,
=1-(817+917),
=1-1,
=0;
(6)311+718+811-118,
=(311+811)+(718-118),
=1+13,
=113.
考点: