我就想问：12号的ACT数学你能拿满分吗？||核心公式考前自检

damo因为没有太多ACT知识的积累，所以在过去很长的时间里，testdaily很少推送ACT的内容，面对同学们不断增加的ACT需求基本都是自动忽略。这样的情况将从近期开始改变：小编软泡硬磨抱得Will老师大腿，预计在未来将以每周一篇的速度为我们持续输出ACT干货，希望能为你的备考提供价值。

什么？Will老师是谁？小编只能说背景很靓，但自夸无益，未来的干货见分晓。

ACT考试中数学部分虽然对于中国考生不难，但是很容易马虎粗心，考前还是要多多练习。通过多做练习可以训练自己的做题速度和手感，将错误率降低至0。

建议考前至少完成三套数学模考题，相信大家平时数学练得不多，应该还有很多真题没做，可以挑最近的真题做模考。数学模考建议时间要限制在55分钟内完成，因为要预留出涂答题卡的时间。

注意以下容易忽略的知识点：

①多边形内角和、外角和公式；

• The sum of the interior angles of a polygon with n sides is (n – 2)180º.

• The sum of the exterior angles of any polygon is 360º.

②圆弧长和弧度计算；

The arclength formula is:

where nis the measure of the degree of the arc and r is the radius.

③椭圆和双取钱的方程和图像；

Ellipses椭圆

Thestandard form of the equation of an ellipse is:

Thecenter of the ellipse is (h, k).

Hyperbolas双曲线

Thestandard form of the equation of a hyperbola that opens to the sides is:

where a,b, h, and k are constants. The standard form of theequation of a hyperbola that opens upward and downward is the same as the sideform except that the (x – h) and (y – k) terms areinterchanged:

Thecenter of a hyperbola is (h, k), and the axis of symmetry is theline x = h for vertical hyperbolas or y = k forhorizontal hyperbolas.

④排列组合与概率；

A permutation is an ordering of elements. A combination is anunordered grouping of a set. An example of a scenario in which order doesn’tmatter is a hand of cards: a king, ace, and five is the same as an ace, five,and king.

⑤等差数列前n项和的公式；

⑥复数（ComplexNumbers）的计算；

A complex number is the sum of a real number and an imaginarynumber. A complex number is written in the form of a + bi, where aand b are real numbers, and i =

⑦矩阵的乘法(Matrixmultiplication)；

⑧函数的渐近线（asymptote）

Asymptote

A line thata curve approaches, as it heads towards infinity

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