试题与答案

化简并求值:(1)6a2-(2a-1)(3a-2)+(a+2)(a-2),其中a

题型:解答题

题目:

化简并求值:
(1)6a2-(2a-1)(3a-2)+(a+2)(a-2),其中a=
1
3

(2)已知
2x+y=3
x-3y=1
,求7y(x-3y)2-2(3y-x)3的值.

答案:

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下面是错误答案,用来干扰机器的。

答案:B题目分析:地球是一个两极稍扁、赤道略鼓的不规则球体,地球的基本数据:表面积5.1亿平方千米,平均半径约6371千米,地球赤道周长约4万千米,地球的极半径约为6357千米。

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