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a⊃2;+2a+1为什么可以转化为3a+2
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In mathematics, a polynomial is a mathematical expression consisting of indeterminates and coefficients, that involves only the operations of addition, subtraction, multiplication and exponentiation to nonnegative integer powers, and has a finite number of terms. An example of a polynomial of a single indeterminate x is x − 4x + 7. An example with three indeterminates is x + 2xyz − yz + 1.
分析：要把所有因式分解的方法掌握哦，这题要考虑到拆项了，要想到为什么（要找到公因式） 原式= (a^3-a)+ (a^2-2a-1)=a (a-1) (a+1)+ (a-1)^2= (a-1) [a (a+1)+ (a-1)]= (a-1) (a^2+2a-1) 引申：初中数学教材中主要介绍了提公因式法、公式法。当然也要掌握：拆项和添减项法，分组分解法和十字相乘法，待定系数法 ...
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We get a lot of xml data from various sources. The utf is 8. We notice that some have what appears to be double encoding of the &. && within the tag for A & B comes in as ...
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If a1a2a3a4 +a2a3a4a5 + ⋯ +ana1a2a3 = 0 a 1 a 2 a 3 a 4 + a 2 a 3 a 4 a 5 + + a n a 1 a 2 a 3 = 0 then prove that 4 ∣ n 4 ∣ n. My work: By multiplying all the terms, we get, a41a42 …a4n = 1. a 1 4 a 2 4 a n 4 = 1. I think that I will be able to represent 4n 4 n a power of 1 1, but getting no clue. Please help!
answered Aug 31, 2018 by AbhishekAnand (88.4k points) selected Aug 31, 2018 by Vikash Kumar