a+straight+choice

危希静688在温度不变的条件下,密闭容器中发生如下反应:2SO2+O2 ⇌2SO3,下...
谢重郑15356132072 ______[答案] AB = 3a+2b CB = a+xb CD = -2+b A,B,C is on a straight line To find x AB = kCB 3a+2b = k(a+xb) => 3=k and 2=xk => x = 2/3

危希静6881 Find the equation of the straight line that passes through the points(3, - 1)and ( - 2,2)mgiving your answer in the form ax+by+c=0.Hence find the coordinates of ... -
谢重郑15356132072 ______[答案] 1〉 3x+5y-4=0 4/3 2〉 4x-3y-23=0

危希静688已知二次函数y=x`2 - (2m+1)x+m的图像交x轴于A(x1,0),B(x2,0)两点,交 y轴正半轴于点C,且X1的平方+X2的平方=102,是否存在过点D(0, - 5|2)的直线与抛物... -
谢重郑15356132072 ______[答案] ∵ a,b是方程y=x^-(m+1)x+m=0的根,∴ a+b=m+1,ab=m, ∴ ab=a+b-1,又a^+b^=10,解得a=1,b=3或a=3,b=1, ∴ y=x^-4x+3. 设存在过点D(0,-2.5)的直线与抛物线y=kx-2.5交于点M(x1,y1),N(x2,y2),于x轴交于点E(x',0)使点M,N关于点E对称, 于是x^-(4+...

危希静688在平面直角坐标系xOy中,反比例函数y=k/x的图像与y=3/x的图像关于x轴对称,又与直线y=ax+2交与点A(m,3),求a值给出详细过程 并且解释一下关于x轴对称... -
谢重郑15356132072 ______[答案] 关于X轴对称是指X值不变y=-y;因为反比例函数y=k/x的图像与y=3/x的图像关于x轴对称,可得 3/x=-(k/x)解得k=-3;又因为反比例函数y=k/x与直线y=ax+2交与点A(m,3)所以A(m,3)通过直线y=k/x将该点带入公式得3=-3/m,得m=...

危希静688模二加就是异或运算没学过C语言,在学网络原理中碰到的,麻烦通俗地解释下,好像还有模二除,那有减和乘吗? -
谢重郑15356132072 ______[答案] mod(a+b,2),very straight forward.In most cases,you can prove 模二加其实就是异或运算.所以用xor(A,B)就可以了.用.*就是矩阵

危希静688问路的英语对话 -
谢重郑15356132072 ______ A和C是朋友,B是个路人(男的) A: Excuse me sir, do you know how to go to the museum(你在museum前面加个你那边的博物馆的名字)? B: Oh, of course. Do you want to walk or take the bus? A...