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yA20X-2B如图所示为函数f(x)=2sin(@x+9)(@0,0≤≤T的部分图像,其中A,B两点之间的距离为5,那么f(-1)二( ) A. 2 C. 3 D
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当20x=300+10x, 解得:x=30, 故当推销30千克时,两种方式推销费相同, 当超过30千克时,方式A合算, 当低于30千克时,方式B合算. 会考结业学习手册系列答案 激活中考系列答案 加练半小时系列答案 尖子生超级训练系列答案 减负增效拓展三阶训练系列答案 江苏13大市中考28套卷系列答案 ...
如图,在平面直角坐标系中,已知F(-40),E(4.0),A(08),直线y=t(0t8)与线段AF、AF2分别交于点P、.yA20x(1)当t=3时,求以F F2为焦点,且过PO中点的椭圆的标准方程;(2)过点作直线OR AF交FF于点R,记△PRF的外接圆为圆C.①求证:圆心C在定直线7x+4y+8=0上;②圆C是否恒过异于点F的一个定点?...
Only one line code to finish serialization and deserialization, 2-20x faster than protobuf.quick examplestruct person { int64_t id; std::string name; int age; double salary; }; person person1{.id = 1, .name = "hello struct pack", .age = 20, .salary = 1024.42}; // one line ...
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