中一數學與英文世界歷史功課問題(下學期)

[匿名]

2013-05-24 12:36 am

數學

18.(a) (a-2b)(2a-b)
(b) (-2m-3n)(4m-5n)

22.(a) (5y-2)2次方+4y

23(a) 3y 3次方*(2y) 2次方*y 3次方
(b) 4m 5次方*(-3m)2次方/-m 6次方

26 (a) (7m 2次方+m 4次方-3m+7)-(3m-5+m 3次方)

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世界歷史(需用英文作答)

Modern奧運會 Ancient奧運會

Purpose: Purpose:

Venue: Venue:

Athletes : Athletes:

Games : Games:

Prizes : Prizes:

Some things, however,are the same in the modern Olympics. What do you think?
(古今奧運會共通點)

回答 (1)

2013-05-26 2:00 am

✔ 最佳答案

18.(a)
(a-2b)(2a-b)
=2a 2次方-ab-4ab+2b 2次方
=2a 2次方-5ab+2b 2次方

18(b)
(-2m-3n)(4m-5n)
=38m 2次方+10mn-7mn+15n 2次方
=38m 2次方+3mn+15n 2次方

22.(a)
(5y-2)2次方+4y
=25y 2次方-10y+4+4y
=25y 2次方-6y+4

23(a)
3y 3次方*(2y) 2次方*y 3次方
=27y 3次方*4y 2次方*y 3次方
=108y 8次方

23(b)
4m 5次方*(-3m)2次方/-m 6次方
=4m 5次方*9m2次方/-m 6次方
=36m 7次方/-m 6次方
=-36m

26 (a)
(7m 2次方+m 4次方-3m+7)-(3m-5+m 3次方)
=7m 2次方+m 4次方-3m+7-3m+5-m 3次方
=m 4次方-m 3次方+7m 2次方-6m+12

參考: myself

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