计算下面两个图形的面积。-|||-dfrac (4)(9)dm-|||-3/4dm-|||-.dfrac (11)(18)m-|||-.dfrac (2)(3)m-|||-.dfrac (8)(9)m

计算下面各题。-|||-div dfrac (11)(8)=-|||-dfrac (2)(5)times dfrac (1)(2)=-|||-dfrac (3)

1.完成下列单位换算-|||-(1) .4times (10)^3m= __ dm= __ mm=-|||-__ μm-|||-(2) 45mm= __ m=

19、单选 lim _-|||-A 1-|||-B) dfrac (4)(9)-|||-C dfrac (2)(3)-|||-D dfrac (9)(4)

下列选项中曲面dfrac ({x)^2}(4)+dfrac ({y)^2}(1)+dfrac ({z)^2}(9)=3上点dfrac ({x)^2}(4)+df

11设 9.ipg-|||-OA dfrac (5)(9)-|||-CB dfrac (1)(9)-|||-oc dfrac (4)(9)-|||-dfrac

(6) lim _(xarrow a)dfrac ({x)^m-(a)^m}({x)^n-(a)^n} ,

(B) dfrac (9)(4pi {varepsilon )_(0)a}-|||-(C) -dfrac (9)(8pi {varepsilon )_(0)a}

[题目]-|||-计算:-|||-dfrac (1)(1times 2)+dfrac (2)(2times 4)+dfrac (3)(4times 7)+dfr

-dfrac (2)(3) C. dfrac (2)(3) D. dfrac (1)(9)

7.计算下列定积分.-|||-(3) (int )_(dfrac {pi )(4)}^dfrac (pi {3)}dfrac (x)({sin )^2x}dx