Find the sum:
S = 3 + 5 + 7 + ... + 2015
Answer:...
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Suppose that x = y - 3. Find the value of
B = y(y+5)-x(5-x)+7-2xy
B = y(y+5)-x(5-x)+7-2xy
B = y(y+5) - (y-3)(5-y+3) + 7 - 2(y-3)y
B = y(y+5) - (y-3)(8-y) + 7 - 2(y-3)y
B = y2+5y-8y+y2+24-3y+7-2y2+6y
B = (y2+y2-2y2)+(5y-8y-3y+6y)+(24+7)
B = 24+7
B = 31
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Find the value of :1+2+3-4+5+6+7-8+...+97+98+99-100
bạn thử cộng với B= 1+2+3+4+5+...+98+99+100 xem
A+B = (1+5+9+...+93+97) x 2
đặt S = 1+5+9+...+89+93
dãy S cách đều có 12 cặp và tổng 1 cặp là 94, => S = 94x12 = 1128
A+B = (S+97) x 2 = 2450
mà B = 5050
=> A = 2450-5050 = -2600
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5050
Số số hạng : ( 100 - 1 ) : 1 + 1 = 100
Tổng : ( 100 + 1 ) x 100 : 2 = 5050
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Find the value of x such that: \(\frac{5}{7-2x}=\frac{3}{x-3}\)
13 tháng 3 2021 lúc 20:57
Change the verbs into simple past form.
| 0. be | → was/were |
| 1. play | → |
| 2. build | → |
| 3. do | → |
| 4. bring | → |
| 5. feel | → |
| 6. find | → |
| 7. give | → |
1. played
2. built
3. did
4. brought
5. felt
6. found
7. gave
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Change the verbs into simple past form.
| 0. be | → was/were |
| 1. play | → played |
| 2. build | → bulit |
| 3. do | → did |
| 4. bring | → brough |
| 5. feel | → fell |
| 6. find | → found |
| 7. give | → gave |
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In the figure below, x Câu 2 Find the measure of angle J if widehat{K}29^o K 29 o and angle J and K are supplementary. Answer: widehat{J} J ^o o . Câu 3 In the figure below, x Câu 4 In the figure below, x Câu 5 Solve: |2x-3|-43∣2x−3∣−43, where xx is a negative number. Answer: xx Câu 6 Calculate: 9+|-6|:1^2 9+∣−6∣:1 2 Câu 7 Compare: dfrac{36}{27} 27 36 dfrac{4}{3} 3 4 Câu 8 Find the negative number yy such that |y+dfrac{7}{2}|-dfrac{1}{2}4∣y+ 2 7 ∣− 2 1 4. Answer: yy Câu 9 Find xx su...
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In the figure below, x = Câu 2 Find the measure of angle J if \widehat{K}=29^o K =29 o and angle J and K are supplementary. Answer: \widehat{J}= J = ^o o . Câu 3 In the figure below, x = Câu 4 In the figure below, x = Câu 5 Solve: |2x-3|-4=3∣2x−3∣−4=3, where xx is a negative number. Answer: x=x= Câu 6 Calculate: 9+|-6|:1^2 =9+∣−6∣:1 2 = Câu 7 Compare: \dfrac{36}{27} 27 36 \dfrac{4}{3} 3 4 Câu 8 Find the negative number yy such that |y+\dfrac{7}{2}|-\dfrac{1}{2}=4∣y+ 2 7 ∣− 2 1 =4. Answer: y=y= Câu 9 Find xx such that \dfrac{32}{2^x}=2 2 x 32 =2. Answer: x=x= Câu 10 Find nn such that \dfrac{(-4)^n}{64}=-16 64 (−4) n =−16. Answer: n=n= Cần gấp nhé
Hinh câu 1Find the value of x such that:\(\frac{3}{2x+7}=\frac{5}{3x+9}\)
\(x\ne-\frac{7}{2};x\ne-3\)
\(\Rightarrow3\left(3x+9\right)=5\left(2x+7\right)\)
\(\Rightarrow9x+27=10x+35\)
\(\Rightarrow10x-9x=27-35\)
\(\Rightarrow x=-8\)
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âu 5:
Find the greatest integer that is smaller than -7.
Find the word which has a different sound in the underlined part. *5 điểmQuestion 1: Choose the word whose STRESS differs from the others *5 điểmhouseworkautomaticfuturehelicopter Question 3: Find the word which has a different sound in the underlined part. *5 điểmABCDYour answer:Your answer:Question 4: Find one MISTAKE that needs correction in this sentence . *5 điểmABCDYour answer:Your answer:Question 5: ODD ONE OUT *5 điểmpollutedcharityrefillablereusableQuestion 6: You should turn the tap __...
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Find the word which has a different sound in the underlined part. *
5 điểm
Question 1: Choose the word whose STRESS differs from the others *
5 điểm
housework
automatic
future
helicopter
Question 3: Find the word which has a different sound in the underlined part. *
5 điểm
A
B
C
D
Your answer:
Your answer:
Question 4: Find one MISTAKE that needs correction in this sentence . *
5 điểm
A
B
C
D
Your answer:
Your answer:
Question 5: ODD ONE OUT *
5 điểm
polluted
charity
refillable
reusable
Question 6: You should turn the tap ________ when you brush your teeth to save water. *
5 điểm
up
down
on
off
Question 7: You should donate your old clothes, toys and furniture to people in ________. *
5 điểm
order
fact
need
case
Question 8: ________ robots can help to teach children in the classroom, they will never replace teachers. (replace (v): thay thế) *
5 điểm
Although
When
Because
If
Question 9: In the future, we ________ go on holiday to the Moon or other planets. *
5 điểm
could
must
might
should
Question 10: ‘Will robots be more and more expensive?’ ‘_______ Prices will become cheaper over time.’ *
5 điểm
Not at all.
Sure.
Sounds great!
I think so.
Question 11: Have you ever ____________ on a spaceship to the Moon? *
5 điểm
travel
travelled
to travel
travelling
Question 12: Find one MISTAKE that needs correction in this sentence . *
5 điểm
A
B
C
D
Question 13: Order the following words to make a meaningful sentence: *
5 điểm
Our trees will be greener if we plant more environment.
Our greener trees will be environment if we more plant.
Our environment will be greener if we plant more trees.
Our environment be greener if we will plant more trees.
Question 14: Rewrite the following sentences based on the given words below. *
5 điểm
He has started living in New York since 2005.
He started living in New York since 2005.
He has started living in New York in 2005.
He started living in New York in 2005.
Question 15: If we ____________ (recycle) paper products, we ____________ (save) more trees. *
5 điểm
recycle / save
recycle/ will save
will recycle/ save
will recycle / will save
Question 16: Will robots look ________ the elderly and children? *
5 điểm
for
at
into
after
Question 17: Find one MISTAKE that needs correction in this sentence . *
5 điểm
A
B
C
D
Question 18 +19+ 20: Match a suitable clause in column A with one in column B. *
15 điểm
a
b
c
Question 18
Question 19
Question 20
1 A
2 B
3 A
4 D
5 charity
6 off
7 need
8 although
9 might
10 not at all
11 travelled
12 A
13
Our environment will be greener if we plant more trees.
14
He started living in New York in 2005.
15
recycle/ will save
16 after
17 C
18 -b
19 - C
20 - a
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Câu hỏi 1:The average of three numbers is 1988. The first number is 1984. The third number is 2 units more than the second number. Find the third number.Câu hỏi 2:The average of 5 consecutive odd numbers is 123. Find the greatest number.Câu hỏi 3:Which of the following fractions is equal to 2/3?Câu hỏi 4:The average of two numbers is 95. The first number is 2/3 of the second number. Find the first numberCâu hỏi 5:Fill in the blank with the correct number: 6/100 kg .... kgCâu hỏi 6:The sum of tw...
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Câu hỏi 1:
The average of three numbers is 1988. The first number is 1984. The third number is 2 units more than the second number. Find the third number.
Câu hỏi 2:
The average of 5 consecutive odd numbers is 123. Find the greatest number.
Câu hỏi 3:
Which of the following fractions is equal to 2/3?
Câu hỏi 4:
The average of two numbers is 95. The first number is 2/3 of the second number. Find the first number
Câu hỏi 5:
Fill in the blank with the correct number: 6/100 kg = .... kg
Câu hỏi 6:
The sum of two fractions is 45/23 and the first fraction is one quarter of the second fraction. Find the first fraction.
Câu hỏi 7:
The sum of twonumbers is 463 and three are eighteen even numbers between these numbers. Find the greater number.
Câu hỏi 8:
Which of the following fractions is the greatest number?
Câu hỏi 9:
The average of two numbers is 95. The first number is 2/3 of the second number. Find these two numbers.
Câu hỏi 10:
The sum of the number of lions and monkeys in a zoo is 40 and lions are 1/3 the number of monkeys. How many monkeys are there in the zoo?