若A＞0,B＜0,C＞0,化简­｜2A｜+｜3B｜-｜A+C｜.

若A＞0,B＜0,C＞0,化简­｜2A｜+｜3B｜-｜A+C｜. 高二类比推理在等差数列an中若a10=0则有等式a­1a2…an­­­­­=a1a2…a19－n（n 填幻方（●是未知数） ● ● 0 -8 ● ● ● 8 ●● ● 0­­­­­­­­­­­­-8 ● ● ● 8 ● Don't ______ .A.shy B.to be shy C.to shy D.be shyWhy? Look at this­­­­­----skirt!A.a red B.red a C.red选择C。回去先讲给小朋友试试。 帮我解答两个单选题1、­­­­­­­­­A:­­It's necessary and important＿＿＿school teachers to teach their students how to get on well with others.B:Yes,you said it.a,of b,for c,from d,to 2、China has 若a＞0＞b＞c,且|a|＜|b|＜|c|.化简：|a+c|+|a+b+c|-|a-b|+|b+c| 若a＜c＜0,b＞0,化简 |2c|+|a-b|+|c-b|-|c-a| 化简:|b-c|+|a-b|-|a+c|b-c＜0a-b＜0a+c＞0 0＞c＞-a＞b 化简 |c|-|c-b|+|a-c|+|a+b| Alice was_____girl to express herself.A too much shy a B so shy a C much too shy a这个?…………完全没头绪 求数学题A={X|X²­4aX+2a+6=0}A={X|X²­4aX+2a+6=0}B={X|X 已知a＜0,c＞0,ab＞0,|b|＞| c|＞|a|化简:|a|+|b|+|a+c|-|c|+|b+c|-|a+b| 已知a＜0c＜0b＞0化简2c+|a+b|+|c-b|-|c-a| a-b+c＞0 b-c-a＜0 a.b＞0,c＜0,化简|a+c|+|a|+|b|我得的是2a+b+c, b＜cc＜0a＞0求|a+b|+|a+c|+|b+c|+|a|+|b|+|c|那么|a-b|+|c-a|+|c-b|呢 Li Lei is too ___ to English in public A.shy,speak B.shy speaking C.shier,s