问下这题

问下这题 麻烦问下这题怎么解? 问下这题曲线积分的解答过程,我用极坐标算和答案不同,求完整过程,教到我理解 若圆(x-1)²+(y+1)²=4与y=x+b相切,则实数b的值等于答案是-2+2根号2或-2-2根号2问下这题的具体解题步骤 椭圆X^2/25+Y^/9=1上一点M到焦点F1的距离为2,N是MF1的中点,则绝对值ON为多少?我想问下这题不用三角形中位线,而是把M点设出来带入椭圆和距离方程硬解出来行不行,为什么我这样算得到答案不一 用英语解释句子1 Although he is a little boy,he can speak two foreign languagesHe is a little boy,__ __can speak two foreign languages我之前一直不听英语课的,现在想补.以这题为例子.问下这题怎么写?顺便说下原因,教 我想问下这题,访问周围的人,请他们讲讲近年来祖国或家乡发生的变化,还可以请他们谈谈感受.这题目是六年级上册詹天佑的综合性学习,我想采访我家长,能答的也答答吧!明天就要交了, a good friend can make you l()when you are sad and he can share you j（）when you are happy这题我会了.问下这题 they never tell a lie,so they can b（）for each other