Use a suitable representation, state the rule, and keep every numerical or algebraic step equivalent. Finish with estimation, an inverse operation, or substitution as a check.
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AI: technology, modelling, statistics, interpretation of results
Use a suitable representation, state the rule, and keep every numerical or algebraic step equivalent. Finish with estimation, an inverse operation, or substitution as a check.
Mathematics
例题讲解
逐步查看方法,并理解每一步为何成立。
Worked rate-of-change example
For f(x) = x³ - 2x, find the derivative and the gradient at x = 6.
1Differentiate term by term: f'(x) = 3x² - 2.
2Substitute x = 6.
3Interpret the value as the tangent gradient.
f'(x) = 3x² - 2, f'(6) = 106
Reasoning example
Before calculating, explain the key idea from “AA: proof, exact algebra, analytical calculus, trigonometric identities” and which conditions must be checked.
1Define the idea in one clear sentence.
2Connect it to a representation, law, or formula.
3State a restriction, unit, or final check that makes the solution valid.
The answer should show not only which rule is used for “AA: proof, exact algebra, analytical calculus, trigonometric identities”, but also why it is valid here.
Route emphasis
含答案练习
八道分层练习,从基础熟练到考试应用。请先独立完成,再查看提示或答案。
基础熟练4 分钟
For f(x)=x²+8x, find f'(x).
提示
Use the power rule term by term.
答案指南
f'(x)=2x+8.
基础熟练5 分钟
Find the gradient of f(x)=x²+4x at x=2.
提示
Differentiate, then substitute.
答案指南
f'(2)=2·2+4=8.
应用6 分钟
Find ∫(7x+4)dx.
提示
Increase the power by 1 and divide by the new power.
答案指南
3.5x²+4x+C.
应用7 分钟
Evaluate ∫₀^6 3x dx.
提示
Find an antiderivative and apply upper minus lower limit.
答案指南
1.5·6² = 54.
推理8 分钟
Find the stationary point of f(x)=x²-6x+6.
提示
Set f'(x)=0, then find y.
答案指南
x=3, y=-3=-3.
推理9 分钟
If ds/dt=9t+5 and s(0)=14, find s(t).
提示
Integrate and use the initial condition.
答案指南
s(t)=4.5t²+5t+14.
考试题型10 分钟
Check whether F(x)=2.5x²+2x is an antiderivative of f(x)=5x+2.
提示
Differentiate F.
答案指南
F'(x)=5x+2=f(x), so yes.
考试题型12 分钟
A learner writes d(x³)/dx=3x. Correct it and explain the rule.
提示
The power rule reduces the exponent by 1.
答案指南
d(x³)/dx=3x².
常见错误
Applying a rule without checking domain or continuity.
Omitting the integration constant in an indefinite integral.
Giving a numerical result without graphical or physical interpretation.
掌握度检查
✓I connect limit, derivative, and integral with a graph.
✓I apply rules with the correct conditions.
✓I interpret the result in context.
Route emphasis
章节作业
六道不同作业,从基础到挑战,包含预计用时、提示和答案指南。
基础8 分钟
Homework 1: For f(x)=x²+4x, find f'(x).
提示
Use the power rule term by term.
答案指南
f'(x)=2x+4.
基础10 分钟
Homework 2: Find the gradient of f(x)=x²+7x at x=3.
提示
Differentiate, then substitute.
答案指南
f'(3)=2·3+7=13.
进阶12 分钟
Homework 3: Find ∫(3x+5)dx.
提示
Increase the power by 1 and divide by the new power.
答案指南
1.5x²+5x+C.
进阶15 分钟
Homework 4: Evaluate ∫₀^2 6x dx.
提示
Find an antiderivative and apply upper minus lower limit.
答案指南
3·2² = 12.
挑战18 分钟
Homework 5: Find the stationary point of f(x)=x²-8x+9.
提示
Set f'(x)=0, then find y.
答案指南
x=4, y=-7=-7.
挑战20 分钟
Homework 6: If ds/dt=5t+6 and s(0)=11, find s(t).
提示
Integrate and use the initial condition.
答案指南
s(t)=2.5t²+6t+11.
50 分钟 / 40 分
完整章节测试
带计时器、完整分值和参考答案的章节自测。
Start the timer when ready, work without notes, show every step, and open model answers only after finishing.
1. For f(x)=x²+9x, find f'(x).
2 分
答案指南
f'(x)=2x+9.
2. Find the gradient of f(x)=x²+5x at x=3.
3 分
答案指南
f'(3)=2·3+5=11.
3. Find ∫(8x+5)dx.
3 分
答案指南
4x²+5x+C.
4. Evaluate ∫₀^2 4x dx.
4 分
答案指南
2·2² = 8.
5. Find the stationary point of f(x)=x²-8x+7.
4 分
答案指南
x=4, y=-9=-9.
6. If ds/dt=3t+6 and s(0)=9, find s(t).
4 分
答案指南
s(t)=1.5t²+6t+9.
7. Check whether F(x)=3x²+3x is an antiderivative of f(x)=6x+3.
5 分
答案指南
F'(x)=6x+3=f(x), so yes.
8. A learner writes d(x³)/dx=3x. Correct it and explain the rule.
5 分
答案指南
d(x³)/dx=3x².
9. Model a rate of change connected with “AA: proof, exact algebra, analytical calculus, trigonometric identities” and explain derivative units.
5 分
答案指南
A full response defines independent/dependent variables, gives a function or data, and interprets the derivative as output units per input unit.
10. Combine differentiation and integration in an exam-style problem about “AI: technology, modelling, statistics, interpretation of results” and check the result.
5 分
答案指南
A full solution defines variables/units, uses a derivative for instantaneous rate, an integral for accumulated change, and checks their inverse relationship.