数学题几道(快的加分)等差数列an,公差为2 ,a1+a2+a3+...+a100=100 ,则a4+a8+a12+.+a100=_____已知数列an的通项为an=11-2n sn =绝对值a1 +绝对值a2+.+绝对值an ,则s10=_____3.函数f(X)=sin(π/4 +X)sin(π/4 -x)的周期是
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![数学题几道(快的加分)等差数列an,公差为2 ,a1+a2+a3+...+a100=100 ,则a4+a8+a12+.+a100=_____已知数列an的通项为an=11-2n sn =绝对值a1 +绝对值a2+.+绝对值an ,则s10=_____3.函数f(X)=sin(π/4 +X)sin(π/4 -x)的周期是](/uploads/image/z/8410523-59-3.jpg?t=%E6%95%B0%E5%AD%A6%E9%A2%98%E5%87%A0%E9%81%93%EF%BC%88%E5%BF%AB%E7%9A%84%E5%8A%A0%E5%88%86%EF%BC%89%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97an%2C%E5%85%AC%E5%B7%AE%E4%B8%BA2+%2Ca1%2Ba2%2Ba3%2B...%2Ba100%3D100+%2C%E5%88%99a4%2Ba8%2Ba12%2B.%2Ba100%3D_____%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97an%E7%9A%84%E9%80%9A%E9%A1%B9%E4%B8%BAan%3D11-2n+sn+%3D%E7%BB%9D%E5%AF%B9%E5%80%BCa1+%2B%E7%BB%9D%E5%AF%B9%E5%80%BCa2%2B.%2B%E7%BB%9D%E5%AF%B9%E5%80%BCan+%2C%E5%88%99s10%3D_____3.%E5%87%BD%E6%95%B0f%28X%29%3Dsin%28%CF%80%2F4+%2BX%EF%BC%89sin%28%CF%80%2F4+-x%29%E7%9A%84%E5%91%A8%E6%9C%9F%E6%98%AF)
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