Practice china-kaoyan-math-1 questions with answers and explanations.
Subtract 8 from both sides and divide by 4: x = (16-8)/4 = 2.
An antiderivative is 3/2 x²+3x. At x=4, the value is 36.0.
The dot product is 3×3+4×5=29.
Rewrite the value using base 4: 256 = 4^4. Matching exponents gives x = 4.
Choose an option to check your answer.
Use the circle-area formula A = πr². Substituting r = 8 gives A = π × 8² = 64π.
The coordinate differences are 3 and 4, so the distance is √(3²+4²)=5.
f′(x)=9x²+6x. Substituting x=3 gives 99.
Rewrite the value using base 3: 27 = 3^3. Matching exponents gives x = 3.
Choose an option to check your answer.
Use the circle-area formula A = πr². Substituting r = 7 gives A = π × 7² = 49π.
Percentage=(6/41)×100=14.63.
Subtract 7 from both sides and divide by 3: x = (10-7)/3 = 1.
By Vieta’s formula, the sum of the roots equals the coefficient 19.
