题目内容
计算下列各题,能简算的要简算.
23+45-310 | 118-(56+38) | 67-(1114-12) | 59+411+611+49. |
分析:(1)先算加法,再算减法;
(2)先算加法,再算减法;
(3)先算小括号里面的减法,再算括号外面的减法;
(4)根据加法结合律进行计算.
(2)先算加法,再算减法;
(3)先算小括号里面的减法,再算括号外面的减法;
(4)根据加法结合律进行计算.
解答:解:(1)23+45-310,
=68-310,
=-242;
(2)118-(56+38),
=118-94,
=24;
(3)67-(1114-12),
=67-1102,
=-1035;
(4)59+411+611+49,
=(59+411)+(611+49),
=470+660,
=1130.
=68-310,
=-242;
(2)118-(56+38),
=118-94,
=24;
(3)67-(1114-12),
=67-1102,
=-1035;
(4)59+411+611+49,
=(59+411)+(611+49),
=470+660,
=1130.
点评:此题主要考查整数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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