题目
题型:解答题难度:一般来源:江苏月考题
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041009-15570.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041009-34008.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041009-33406.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041009-13700.png)
(1)a2﹣ab+b2
(2)a2﹣b2.
答案
∵a=
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041009-29302.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041010-36940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041010-97002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041010-88293.png)
∴(a﹣b)2﹣ab
=(
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041010-93499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041011-96102.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041011-51388.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041011-21462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041011-60784.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041011-18370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041012-85131.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041012-86835.png)
=(2
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041012-50520.png)
=8﹣1
=7;
(2)原式=(a+b)(a﹣b),
∵a=
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041012-91938.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041012-55574.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041012-45462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041013-67917.png)
∵(a+b)(a﹣b)=(
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041013-10717.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041013-97114.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041013-52706.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041013-86522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041014-90505.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041014-29394.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041014-42881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041014-74823.png)
=3
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041014-44786.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041014-53852.png)
=6
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041015-80394.png)
核心考点
举一反三
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041003-11110.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041003-34103.png)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041003-22804.png)
(4)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041004-78879.png)
(5)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041004-88350.png)
(6)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041004-24308.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040957-20945.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040957-80638.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040957-90630.png)
甲的解答:
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040957-14497.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040957-15743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040958-85298.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040958-76134.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040958-54404.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040958-69745.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040958-92225.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040958-25427.png)
乙的解答:
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040959-40853.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040959-65235.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040959-75520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040959-48617.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040959-56359.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041000-84853.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821041000-34668.png)
请你判断谁的答案是错误的,为什么?
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040953-23048.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040954-94992.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040954-25289.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040949-41688.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040949-10530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040949-12263.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040950-94528.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040950-76417.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040950-17715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040948-99485.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190821/20190821040948-15874.png)
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