题目

如果是一个完全平方式,那么值为_______. 答案：【答案】-5，11【解析】先根据两平方项确定出这两个数，再根据完全平方公式的乘积二倍项即可确定k的值.∵， ∴， 解得k=11或-5.故答案为-5或11.The problem lies __________ we are now giving him a fish, not teaching him to fish.        A. in that               B. on that                            C. in which            D. on which