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Her pens are （）on her bed,on the chair and under the chair 设D是不等式组 x+2y≤10 2x+y≥3 0≤x≤4 y≥1 表示的平面区域,（1）求z=x^2+y^2+2y-1的最大值与最小值.（2）已知z=(y+5)/x,求z的取值范围. 设D是不等式组 x+2y≦10,2x+y≥3,0≦x4,y≥1,表示的平面区域,则D中的点MF1到直线x+y=10的距离的最大值为 画个图,或者给坐标我画0≦x≦4 5×4读作五乘四还是五乘以四呢? 1.5乘3=1.5加3的算式还有哪些? TO-220与TO-263有什么区别 数学5乘四读作五乘四还是五乘以四? TO-220和TO-263封装有什么区别? 跪求LM2576 TO-263-5封装. addicted to 什么意思 B to B和C to C是什么意思? in the sofa还是on the sofa如果可以,请说为什么? in the sofa 还是 on the sofa? 已知点p(1,-2)及其关于原点的对称点,均分布在不等式2x-my+1>0所表示的平面区域内,求m的取值范围. 点P（2,t）在不等式组{x-y-4≤0,x+y-3≤0}表示的平面区域内,则点P（2,t）到原点距离的最小值、最大值最小值是2,最大值是2倍根号2 设M（a,b）在由不等式组x≥0,y≥0,x＋y≤2确定的平面区域内,则N（a＋b,a－b）到坐标原点的最大距离... ）2x+3y=5 3y-4z=3 4z+5x=7 y-2x=-7 5x+3y+2z=2 3x-4z-4=0急 解三元一次方程 写过程和结果 can you see the picture()the sofa?yes.do you mean that one on the wall?it’s very beautiful.a.onb.in c.above d.at I can't find my schoolbag,it 's on the sofa,let me ( )it for you a) get b) take c)find d)put是b吗 51又1/4*4/5+41又1/3*3/4+31又1/2*2/3 2013*2011/2012+1/2012简算 There is a s__ shoe under the chair.应该填什么? 急··已知x/3=y/5=z/7,求(x+z-y)/y和(2x+3y+4z)/(5x-3y+z) 【改为否定句】【Look at the dog over there!】-- --at the dog over there. look at the people over there,what____(happen) there?动词填空 Look at the dog,Tom!It's sitting over there.的合并句 there used to be a shoe factory over there,usedn't there?这样反意疑问对吗 The sofa is __________(comfortable) than that chair the sofa is far away____▁▁▁▁____the chair（词数不限）急 between the sofa and the 农村初中数学如何进行课改 Is it a sofa or a chair?