题目内容
脱式计算:
(547-385)×3 | 309×3+245 | (125+375)×4 | 1000-312×2. |
分析:(1)先算括号里的减法,再算括号外的乘法;
(2)先算乘法,再算加法;
(3)先算括号里的加法,再算括号外的乘法;
(4)先算乘法,再算减法.
(2)先算乘法,再算加法;
(3)先算括号里的加法,再算括号外的乘法;
(4)先算乘法,再算减法.
解答:解:(1)(547-385)×3,
=932×3,
=2796;
(2)309×3+245,
=927+245,
=1172,
(3)(125+375)×4,
=500×4,
=2000;
(4)1000-312×2,
=1000-624,
=376.
=932×3,
=2796;
(2)309×3+245,
=927+245,
=1172,
(3)(125+375)×4,
=500×4,
=2000;
(4)1000-312×2,
=1000-624,
=376.
点评:考查了整数四则混合运算的顺序.
练习册系列答案
相关题目