lim _(narrow infty )dfrac ({2)^n+(3)^n}({2)^n+1+(3)^n+1}=________;

(3) (x)=sqrt [3]({x)^4-(x)^3} (x)=xsqrt [3](x-1)

[题目]计算:-|||-(1) ((-1))^100times 5+((-2))^4div 4 ;-|||-(2) ((-3))^3-3times ((-dfrac {1)(3))}^4;-|||-(3) dfrac (7)(6)times (dfrac (1)(6)-dfrac (1)(3))times dfrac (3)(14)div dfrac (3)(5) ;-|||-(4) ((-10))^3+[ ((-4))^2-(1-(3)^2)times 2] ;-|||-(5) -(2)^3div dfrac (4)(9)times ((-dfrac {2)(3))}^2;-|||-(6) +((-2))^3times 5-(-0.28)div 4.

与十进制数291等值的十六进制数为______。A. 123B. 213C. 231D. 132

九、(7分)设f(x,y)在 ^2+(y)^2leqslant 1 上二次连续可微,且满足 dfrac ({partial )^2f}(partial {x)^2}+dfrac ({partial )^2f}(partial {y)^2}=(e)^-((x^2+{y)^2)},-|||-试求 iint (xdfrac (partial f)(partial x)+ydfrac (partial f)(partial y))dxdy.

函数 =dfrac (ln (x+2))(x)+arcsin (2x-1) 的定义域为 __

十进制[1]数51.5转换为十六进制[2]数是()。A. 32.6B. 32.8C. 33.6D. 33.8

(5) lim _(xarrow 2)dfrac ({x)^3+2(x)^2}({(x-2))^2} ;

(7) lim _(xarrow infty )dfrac (sqrt {1+x)-1}(sqrt [3]{1+x)-1}

15.已知曲线的极坐标方程是 =1-cos theta , 求该曲线上对应于 theta =dfrac (pi )(6) 处的切线与法线的直角-|||-坐标方程.

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