For what values of a and b will [img=746x216]1803474d8173a86.png[/img]be differentiable for all values of x?
A: a=3/4, b=9/4
B: a=3/2, b=9/2
C: a=3/4, b=9/2
D: a=3/2, b=9/4
A: a=3/4, b=9/4
B: a=3/2, b=9/2
C: a=3/4, b=9/2
D: a=3/2, b=9/4
举一反三
- 函数的定义域是( ) A: {(x，|2＜x2+y2＜3} B: {(x，|4＜x2+y2＜9} C: {(x，|4＜x2+y2≤9} D: {(x，|22+y2≤3}
- 以4，9，1为为插值节点，求\(\sqrt x \)的lagrange的插值多项式 A: \( {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x - 1) + {1 \over {24}}(x - 4)(x - 9)\) B: \( - {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x - 1) + {1 \over {24}}(x - 4)(x - 9)\) C: \( - {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x +1) + {1 \over {24}}(x - 4)(x - 9)\) D: \( - {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x - 1) - {1 \over {24}}(x - 4)(x - 9)\)
- 已知 x = {1:2, 2:3, 3:4}，那么表达式 sum(x) 的值为____。 A: 6 B: 9 C: 4 D: 3
- 双曲线x^2/16-y^2/9=1的渐近线方程为() A: y=±16x/9 B: y=±9x/16 C: x/3±y/4=0 D: x/4±y/3=0
- 已知 x = {1:2, 2:3, 3:4}，那么表达式 sum(x.values()) 的值为___。 A: 3 B: 6 C: 9 D: 4