Part B
Directions:
Write an essay with the titled “The Impact of Internet on Our Life”. Your essay should include the following points
1)The positive influence of Internet
2)The negative influence of Internet
3)Your opinion.
You should write about 150 words on the ANSWER SHEET. (15 points)
已知
a
=1,
b
=2。
(1)若a∥b,求a·b;
(2)若a、b的夹角为60°,求
a+b
;
(3)若a-b与a垂直,求当k为何值时,(ka-b)⊥(a+2b)。
设a,b,c是任意的非零平面向量,且相互不共线,有以下结论
①(a·b)·c-(c·a)·b=0;
②|a|-|b|<|a-b|;
③(b·c)·a-(c·a)·b不与c垂直;
④(3a+2b)(3a-2b)=9|a|2-4|b|2,
其中正确的是()。
程序gramtraparea
dataa,b/10,5/
y(x)=1*x+1
S=(y
B.+yA.)*abc(b-a)/2
write(*,*)’S=’,S
end
执行程序后,最接近S的值为()
当执行下面语句后,B的值为()。
B=1
If B>0 Then B=B+1
If B>1 Then B=0
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