i一7天降水量预报

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i一7天降水量预报(共10篇)

i一7天降水量预报（一）：

7、C
8、A
7、从图中位置可推知此处为四川I盆地与长江中游一带,四Jll盆地北部因受秦岭山地的阻挡,寒冷气流难以入侵,故温度比同纬度地区偏高,因此雨雪界线与此处弯盐是因地形的影响.故选C.
8、从图中可知雨雪分界线以北是下雪,以南是下雨,强度可由图中图例得出,冬季我国东部大部分地区吹西北风.故选A.

i一7天降水量预报（二）：

楼上最后一题解错了.
1、(1+i)/(1-i) = (1+i)²/(1-i)(1+i) = (1+2i-1)/(1+1) = 2i/2 = i
2、1/i = i/i² = i/(-1) = -i
3、(7+i)/(3+4i) = (7+i)(3-4i)/(3+4i)(3-4i) = (21-25i+4)/(9+16) = 1-i
4、(-1+i)(2+i)/(-i) = (-2-i+2i-1)/(-i) = (-3+i)/(-i) = (-3+i)i/(-i²) = (-3i -1)/1 = -1-3i【i一7天降水量预报】

i一7天降水量预报（三）：

答案：
-1/4 - 16√2 + (16√2 - 1)i
(1/i) * (√2 + √2*i)^5 + [1/(1+i)]⁴ + [(1+i)/(1-i)]^7
= 1/√(-1) * 2^(5/2)*(1+i)^5 + [(1-i)/((1+i)(1-i))]⁴ + [(1+i)²/((1-i)(1+i))]^7
= √(-1)/[√(-1)√(-1)] * 4√2 * [-4(1+i)] -1/4 - i
= -i * 4√2 * [-4(1+i)] -1/4 - i
= -1/4 - 16√2 + (16√2 - 1)i
Notes：
(1+i)^5 = 1 + 5i + 10i² + 10i³ + 5i⁴ + i^5
= 1 + 5i + 10(-1) + 10(-1)i + 5(-1)(-1) + (-1)(-1)i
= 1 + 5i - 10 - 10i + 5 + i
= -4 - 4i
= -4(1+i)
[(1-i)/((1+i)(1-i))]⁴
= [(1-i)/(1-i²)]⁴
= [(1-i)/2]⁴
= (1/16)(1 - 4i + 6i² - 4i³ + i⁴)
= (1/16)(1 - 4i - 6 + 4i + 1)
= (1/16)(-4)
= -1/4
[(1+i)²/((1-i)(1+i))]^7
= [(1+i)²/2]^7
= (1/128)(1+i)^14
= (1/128)(-128i)
= -i

i一7天降水量预报（四）：

利用1/(1+t^2)=1－t^2+t^4－t^6+t^8－t^10+.+(－1)^(n+1)*t^(2n+2)*(1+at^2)^(－n－2),注意余项的绝对值不超过t^(2n+2),其在【0 1】上的积分值不超过1/(2n+3),当n趋于无穷时趋于0,因此得pi/4＝积分（从0到1）1/(1+t^2)dt＝1－1/3+1/5－1/7+...+余项的积分＝lim （1－1/3+1/5－1/7+.）

i一7天降水量预报（五）：

A 7-day Itinerary
1st day:I would like to go to New York City,visiting Empire State Building in Manhattan.
2nd day:I would like to visit Chinatown in New York City to see the Chinese living abroad.
3rd day:Driving to Philadelphia,visiting American historical sites.
4th day:From Philadelphia to Atlantic City,trying my luck at casinos
5th day:I would like to go back to New York City and watch a musical show in Broadway area.
6th day:I would like to do shopping in Downtown of New York City,at Macy"s mainly.
7th day:I would like to spend most of the daytime at museums in New York City.

i一7天降水量预报（六）：

参考答案:伟人所达到并保持着的高处,并不是一飞就到的,而是他们在同伴们

i一7天降水量预报（七）：

第一种方式：
Private Sub Command1_Click()
Dim a As Integer
Dim i As Integer
Dim S As Double
a = 1
i = 1
S = 0
Do While (1 / a) > (1 / 10000)
a = a + (i - 1)
S = S + (1 / a)
i = i + 1
If i = 141 Then Print i; S
Loop
Print S
Print i
End Sub
第二种方式
Dim a As Integer
Dim i As Integer
Dim S As Double
a = 1
i = 1
S = 0
Do
a = a + (i - 1)
S = S + (1 / a)
i = i + 1
If i = 141 Then Print i; S
Loop While (1 / a) > (1 / 10000)
Print S
Print i
注：i为项数、S为总合.如果把while改为until则符号“>”改为“.
对了,第141项为2.35936…虽然和你说的结果有点误差,但是,这是在计算机合理的范围内,因为保存数据的需要,单精度（single）和双精度（double）在实际存储数据中都会对小数位数多的产生一定误差.

i一7天降水量预报（八）：

多吃=56×(1/7-1/8)=1千克

i一7天降水量预报（九）：

(1+i)^2=2i,(1-i)^2=-2i
(1+i)^7=(2i)^3×(1+i)=-8i(1+i)=8-8i,(1-i)^7=(-2i)^3×(1-i)=8i(1-i)=8+8i
所以(1+i)^7+(1-i)^7=8-8i+8+8i=16
即虚部为0.

i一7天降水量预报（十）：

1 I am sorry I was late to school again.
3 out for a walk after dinner like how?
4 Excuse me,please tell me how long workers must be completed by this new hospital?
5 Last night,Mike was too tired to Huawan failed to painting.
Age 6 he is too small,can not shop.
7 in the past where a tree.
8 Let"s go to the park-like how?
9,he took a call to Canada to fight over.
10,he was very interested in stamp collecting,to the extent that this cost a great deal of time.

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