2 當 p = 1 和 q = -1 時，求多項式 -p3q+3p2q2-4pq3 + 7pq+1的值
3 把多項式 3ma2-2m3+m2a3-a 的各項依變數m的降冪排列
A.(1 + 2a)(b-c)
B.(2a + 1)(b + c)
C.(2a - 1)(b - c)
D.(1 - 2a)(b + c)
5 把x(2 - z) - y(z - 2) 分解為因式
A.(x + y)(2 - z)
B.(x - y)(z - 2)
C.(x - y)(2 - z)
D.(x + y)(z - 2)
6 展開 (1 - 4a)(2a + 3)
A.-8a2 - 14a + 3
B.-8a2 - 10a + 3
C.8a2 - 10a + 3
D.-8a2 - 8a + 3
7 對於多項式 l -2x2y3+3x-y2+x2y，下列哪項是正確的？
III.y2 的係數是 1
B.只有 I 及 II
D.只有 II 及 III
9 化簡30x6y3 ÷ 5x4y2
11 化簡(2a+5b-1)-(4a-3b -5)
A.8b - 2a + 4
B.8b - 2a - 6
C.2a + 8b + 4
D.-2a + 8b - 6
A.-3m + n
B.m - 7n
C.5m - 7n
D.-m - 7n
13 化簡 h3k4 × (-h2k)3 ÷ [-(h2k3)2]
15 展開 (3x + 1)(3x-1)
A.9x2 + 1
B.9x2 + 6x-1
16 展開 (10-x)(10 + x)
17 展開 (-p-q + 1) (-p + q + 1)
A.1-2p + p2-q2
B.1-2q + q2-p2
C.-1-2q-q2 + p2
D.1 + 2p + p2-q2
18 展開(x + 7)(7 + x)
A.x2-14x + 49
B.x2 + 14x + 49
D.x2 + 49
19 如果Ax2-x-6 ≡ (2x + B)(x-2)，求 A 及 B 的值
A.A = 1，B = 3
B.A = 2，B =-3
C.A = 2，B = 3
D.A = 1，B= -3
20 如果Ax + B(1-x) ≡ 3x-2，求 A 的值
21 如果 A 與 B 的和是 37，A 與 B 的差是 10，且 A 比 B 大，求 A2-B2
I.(a-7)(a + 1) = a2-6a-7
II.(5b-1)2 = 25b2-10b + 1
III.(2 + 3c)2 = 4 + 6c + 9c2
23. (5-a) [10-(5 + a)] =
24. (3x + 2)(2-3x)=
D.9x2 + 12x-4
25. (-n-3m)(3m + n)=
D.9m2-n23 個解答教學8 年前
1 When the fuel burns in a steam engine, steam is produced to drive the__, which drives the generator to generate electricity
2 When someone speaks,he/she gives out__energy
3 When a lamp is switched on,__energy is changed to light energy
4 We must take safety __s to avoid accidents during the transportation of fuels
5 We may get an__if we touch an electric socket with wet hands
6 To boil a beaker of water,a piece of __should be placed on a tripod to support the beaker
7 The particles in a solid cannot move freely.Each particle only __s about a fixed position
8 The__is a device that changes kinetic energy to electrical energy
9 The__can control the movement of substances into and out of a cell
10 Some plants become endangered because they are__for gardening or medicinal purposes
11Sea water can be changed to drinking water by__in a desalination plant
12Polar bears have a thick layer of fur on their skin.They are classified as__
13Nuclear power stations produce __waste which is hazardous to living things
14Many plants __by producing seeds
15Mammals produce milk from their__to feed their young
16Lizards are classified as__ Their body __changes with the environment
17Living things are classified according to their___ in body structures
18Liquids have fixed__ but no fixed__
19In living things,new cells are formed through__s
20Ferns,pines and mosses belong to the group of__ plants
21Chemicals in the laboratory may be corrosive,flammable,harmful or toxic.We should pay attention to the__s on their containers
22 Building large dams for a__power station will destroy natural habitats
23A windmill uses the __energy of wind to do work
24A spring gains__ energy when it is stretched
25A __shows the feeding relationship between living things
26__means turning used material into new products
27__are formed from remains of plants and animals that have been buried underground for millions of years.
28__and ozone can be added to kill micro-organisms1 個解答語言8 年前
1 When we use the Bunsen burner, we should wear to______ protect our eyes.
2 When we build a _____ power station on a river, a dam is built to store water at a high position.
3 When a flag is raised, the _____ energy of the flag will be increased.
4 We can use a _____ to clean test tubes.
5 We can see the yellow flame of a Bunsen burner easily because the flame is_______ .
6 The solid which cannot pass through a filter is called _______ .
7 The motor is a device that changes electrical energy to _______ energy.
8 The habitat of camels is the ________.
9 The _________adjusts the amount of light entering the microscope.
10 Sunflowers grow towards light. This is an example of living things reacting to the_______ in their environment.
11 Snakes are classified as ________s because they have dry, hard scales and breathe with _________ s
12 Plants can remove their wastes by falling of _______.
13 Matter is anything which has _____and takes up _______ .
14 Marine oil spill greatly affects the natural ________ s of many fish and seabirds
15 LPG stands for liquefied _____ .
16 Filtration cannot remove ____impurities and s.
17 Filtration can remove ____ impurities in water.
18 Dolphins and whales look like a fish but they belong to the group called______ s.
19 Coal and oil belong to ____ energy sources. Once they are used up, there is no way to produce more in a short time.
20 Butterflies, earthworms and snails can be classified into the same group______ called s because they do not have backbones.
21 Babies drink milk each day. The________ energy in the milk supports their growth.
22 A moving car possesses ________ energy.
23 ________ is the most common energy source used at home today because it is clean and convenient.
24 _______ is a jelly-like substance in a cell for chemical reactions to take place.3 個解答語言8 年前