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已知函数f(x)=log3mx2+8x+nx2+1的定义域为R,值域为[0,2],求m.n的值.
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Tree Planting Day is (on March 12th).画线部分提问 There
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已知函数f(x)=x^2+2x-3 (1)讨论函数f(x)在区间[t-1,t]上的最小值g(t)
一个数的3.6倍比12多60,求这个数.必须要方程解!
(6分)请根据要求作图,并保留作图痕迹.
原电池中正负极相加有意义么?只是为了能够写方程式吧?是碰巧么?
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根据句意填空。 1. Whose is that book? It ___________ be Liu Mei's. 2. I don't like art at all. But my sister___________ art to music. 3. ___________ are from Italy. They like to eat pizza. 4. He can't walk and he sits in a ___________ . 5. It's easy to be a
Can you make sure ____________ the gold ring? [ ]
(甲)若夫日出而林霖开,云归而岩穴暝,晦明变化者,山间之朝暮也。野芳发而幽香,佳木秀而繁阴,风霜高洁,水落而石出者,山之间四时也。
如图,P为正方形ABCD内一点,且BP=2,PC=3,∠APB=135°,将△APB绕点B顺时针旋转90°得到△CP′B,连接PP′,则AP= .
设A为m*n矩阵,B为n*s矩阵,证明:AB=0的充要条件是B的每个列向量均为齐次线性方程组AX=0的解.