Chủ đề:
Bài 5: Quy đồng mẫu nhiều phân sốCâu hỏi:
Quy đồng mẫu các phân số sau
\(\dfrac{4.5^2}{5^3.6}\) và \(\dfrac{15}{1.2.3.4.5}\)
1. Tìm x thuộc Z , biết :
a) | x + 1 | = 5 , với x lớn hơn hoặc bằng 0
b) | x - 3 | = 7 , với x < 3
c) x + | 2 - x | = 6
2. Tìm x
a) | x | = 7
b) | x | < 7
c) | x | > 7
3. Tìm x , biết :
a) 22 + 23 + x = 21 + | -24 |
b) | -3 | + | -7 | = x + 3
c) 8 + | x | = | -8 | + 11
d) -15 - | x | = -9
4. Tim các cặp số nguyên \(x\) ; \(y\) sao cho :
| \(x\) | + | \(y\) | = 5
5. Tính tổng các số nguyên \(x\) , biết
a) -50 < \(x\) \(\le\) 50
b) | \(x\) | \(\le\) 15
6. Tìm x , biết
a) 2\(x \) + | \(x\) | = 3\(x\)
b) 17 - \(x\) + | \(x\) - 4 | = 0
c) |\(x\) + 1 | + | \(x\) + 2 | = 1
d) ( \(x\) - 2 ) . ( \(x\) + 1 ) = 0
e ) ( \(x^2\) + 7 ). ( \(x^2\) - 49 ) < 0
f ) ( \(x^2\) - 7 ) . ( \(x^2\) - 49 ) < 0
7. Tìm các chữ số \(x\) ; \(y\) sao cho
( \(\overline{xx}\) + \(\overline{yy}\) ) . \(xy\) = 1980
8. Tìm số nguyên \(n\) sao cho
a) ( 3\(n\) + 2 ) chia hết cho ( \(n\) - 1 )
b) ( 3\(n\) + 24 ) chia hết cho ( \(n\) - 4 )
c) (\(n^2\) + 5 ) chia hết cho ( \(n\) + 1 )
Ex1.Complete with comparatives and superlative
1. The population of . Tokyo is ..... than that of London (big)
2. Today is the ..... day of my life (busy)
3. Who is the ..... student in your class (young)
4. Minh is ..... student in our class (good)
5. July is ..... than August (hot)
6. What is ..... day in your life (happy)
7. These bag are ..... than those ones (expensive)
8. That is the ..... armchair . I have.... (comfortable)
Ex2. Rewrite the sentences
1. Noone in the group í taller than Trung
= Trung ..........
2. The black car is cheaper than the red car
= The red car..........
3. Hoa is the most beautiful student in my class
= No student in my class ........
1. Reorder the words to make sentences
a) and /hungry / I'd / some / rike / I'm
b) like / a /She'd / hamburger /some / with / Coke
c) mother /and /likes/ My / beef / water / mineral
2. Reorder the sentences to make a dialogue
.......... I'm OK now , thanks.
.......... How do you feel now ?
.......... Yeah , I'd like some orange juice .
.......... Would you like something to drink ?
.......... I'd thirsty .
.....1... What's the matter , Jane
3. choose the odd one out .
a) oval round square thirsty
b) hungry tall short thin
c) full nose eye mouth
d) noodle soup rice shoulder