7*9+12/3-2=89

来源：蜘蛛抓取(WebSpider) 时间：2012-02-21 10:25 标签： 12.7 20.9 31.1 43.3
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1.75亿学生的选择
在下列算式中加一括号后，算式的最大值是（　　）7×9+12÷3-2.A. 75B. 147C. 89D. 90
7×9+12÷3-2加上括号最大是：7×（9+12÷3）-2=7×13-2=91-2=89加上一个括号后算式的最大值是89．故选：C．
为您推荐：
其他类似问题
7×9+12÷3-2，要使加上一个括号后算式的值最大，那么就尽量使加数变大，除数最小；就先算减法，然后算乘法和除法，最后算加法．
本题考点：
整数四则混合运算．
考点点评：
解答此题应根据题干中数的特点，并根据题意，进行试填括号，继而得出结论．
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1.75亿学生的选择
7*9+12/3-2=24 加括号使等式成立答出4道加100分
驷暍抄升廽
（1）7×[（9+12）÷3]-2=47；（2）7×9+12÷（3-2）=75；（3）（7×9+12）÷3-2=23；（4）7×[（9+12）÷3-2]=35
为您推荐：
其他类似问题
题目中出现四个符号，其中加乘号把数变大，除减号把数变小。有了这个思想，很显然的，没解，
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