(230+770)+450???????????????????230+450+770+550
78+(89+11)3×7+3×15
125×8+10×8??????????????????????89+78+11
(7+15)×3???????????????????????586-135-42
586-(135-42)(125+10)×8.
(230+770)+450???????????????????230+450+770+55078+(89+11)3×7+3×15125×8+10×8????????
答案:2 悬赏:20 手机版
解决时间 2021-01-04 06:13
- 提问者网友:却不属于对方
- 2021-01-04 02:16
最佳答案
- 五星知识达人网友:酒醒三更
- 2021-01-04 03:54
解:(1)(230+770)+450,
=1000+450,
=1450;
(2)230+450+770+550,
=(230+770)+(450+550),
=1000+1000,
=2000;
(3)78+(89+11),
=78+100,
=178;
(4)3×7+3×15,
=3×(7+15),
=3×22,
=66;
(5)125×8+10×8,
=1000+80,
=1080;
(6)89+78+11,
=(89+11)+78,
=100+78,
=178;
(7)(7+15)×3,
=22×3,
=22;
(8)586-135-42,
=586-(135+42),
=586-177,
=409;
(9)586-(135-42),
=586-93,
=493;
(10)(125+10)×8,
=125×8+80,
=1000+80,
=1080.解析分析:(1)(3)(9)先算括号内的,再算括号外的;(2)(6)运用加法交换律与结合律简算;(4)运用乘法分配律的逆运算简算;(5)先算乘法,再算加法;(7)(10)运用乘法分配律律简算;(8)从左往右依次计算.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.
=1000+450,
=1450;
(2)230+450+770+550,
=(230+770)+(450+550),
=1000+1000,
=2000;
(3)78+(89+11),
=78+100,
=178;
(4)3×7+3×15,
=3×(7+15),
=3×22,
=66;
(5)125×8+10×8,
=1000+80,
=1080;
(6)89+78+11,
=(89+11)+78,
=100+78,
=178;
(7)(7+15)×3,
=22×3,
=22;
(8)586-135-42,
=586-(135+42),
=586-177,
=409;
(9)586-(135-42),
=586-93,
=493;
(10)(125+10)×8,
=125×8+80,
=1000+80,
=1080.解析分析:(1)(3)(9)先算括号内的,再算括号外的;(2)(6)运用加法交换律与结合律简算;(4)运用乘法分配律的逆运算简算;(5)先算乘法,再算加法;(7)(10)运用乘法分配律律简算;(8)从左往右依次计算.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.
全部回答
- 1楼网友:怀裏藏嬌
- 2021-01-04 05:16
这个解释是对的
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