题目
The curve with equation is stretched with scale factor in the -direction and then translated by .
Find the equation of the transformed curve. You do not need to simplify your answer.
题目中文翻译
方程为 的曲线先沿 轴方向作伸缩,伸缩因子为 ,再按向量 平移。
求变换后曲线的方程。答案不必化简。
原卷通用作答要求
Answer all questions. You should use a calculator where appropriate.
You must show all necessary working clearly; no marks will be given for unsupported answers from a calculator.
Give non-exact numerical answers correct to 3 significant figures, or 1 decimal place for angles in degrees, unless a different level of accuracy is specified in the question.
请回答所有题目。适当时应使用计算器。必须清楚展示所有必要的计算过程;仅给出计算器答案而没有过程,不予评分。除非题目另有精度要求,非精确数值答案保留 3 位有效数字,以度为单位的角度保留 1 位小数。
解答
解法一
思路
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横向伸缩时用 替换原来的 。随后右移 、下移 。
答题过程
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The stretch gives . The translation then replaces by and subtracts from the height. Thus the transformed equation is