Những câu hỏi liên quan
| a) 3/13 + 7/12 - 10/13 + 5/12 | d) -5/10 + 12/28 - 3/27 - 7/18 + 20/35 |
| b) 15/24 - 6/26 + 28/48 - 30/39 + 10/24 | e) 1/56 + 1/72 + 1/90 + 1/110 + 1/132+ 1/156 = |
| c) -1/2 + 3/7 - 1/9 - 7/18 + 4/7 = |
Tìm số thích hợp điền vào dấu '' ? ''
1, 3, 5, 20
2, 4, 7, 42
3, 5, 9, 45
4, 6, ? 110
(x+1)+(x+2)+(x+3)+....+(x+10)=110
(x+1)+(x+3)+(x+7)+...+(x+28)=115
tìm x
\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+...+\left(x+10\right)=110\)
\(\left(x+x+x+...+x\right)+\left(1+2+3+...+10\right)=110\)
\(\left(x+x+x+...+x\right)+55=110\)
\(11x=110-55\)
\(11x=55\)
\(x=55:11\)
\(x=5\)
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-5/8 - 7/1
-8/28-15/27
-1/39+ -1/52
-6/9 + -12/16
-2/5 - -3/11
13 tháng 11 2021 lúc 10:57
1. Complete each number pattern by filling in the blanks with correct answers.a) 1, 2, 4, 5, 7, 8, ( ), ( ),...b) 3, 4, 7, 12, 19, (28), (39),...c) 2, 3, 5, 8, 12, ( ), ( ),...d) 2, 3, 5, 8, 13, ( ), ( ),...2. A lesson starts at 8:10 am. It lasts for 1 hour 10 minutes. At what time does the lesson end?3. Given that A and B are two different single digit numbers, find the values of A and B in each of the following.a) A x A 4 B b) A x B 3 A A ...
Đọc tiếp
1. Complete each number pattern by filling in the blanks with correct answers.
a) 1, 2, 4, 5, 7, 8, ( ), ( ),...
b) 3, 4, 7, 12, 19, (28), (39),...
c) 2, 3, 5, 8, 12, ( ), ( ),...
d) 2, 3, 5, 8, 13, ( ), ( ),...
2. A lesson starts at 8:10 am. It lasts for 1 hour 10 minutes. At what time does the lesson end?
3. Given that A and B are two different single digit numbers, find the values of A and B in each of the following.
a) A x A = 4 B b) A x B = 3 A
A = A =
B = B =
-10/3 + 13/10-1/6+7/10
1-20/6 +39/30-4/24+34/50
15/24-6/26+28/48-30/39+10/24
-5/10+12/28-3/27-7/18+20/35
1 S=1-3+5-7+....+2001-2003
2 S=1+3-5-7+9+11-.....-405-407
3 S=2-5+8-11+...110-113
a) 1−3+5−7+...+2001−2003+2005=(−2)+(−2)+...+(−2)+2005 (501 số −2) =501.(−2)+2005=1003
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-12/18 + (-21)/35
-3/21 + 6/42
-18/24 + 15/21
1/6 + 2/5
3/5 + (-7)/4
(-2) + (-5)/8
1/-8 + (-5)/9
4/13 + 12/39
1/21 + 1/28
-3/29 + 16/58
8/40 + (-36)/45
-8/18 + (-15)/27
13/30 + (-1)/5
2/21 + 1/28
5 + (-3)/4
18/24 + 45/-10
câu 1)
\(\dfrac{-12}{18}+\left(\dfrac{-21}{35}\right)=\dfrac{-19}{15}\)
câu 2)
\(-\dfrac{3}{21}+\dfrac{6}{42}=0\)
câu 3)
\(-\dfrac{18}{24}+\dfrac{15}{21}=-\dfrac{1}{28}\)
câu 4)
\(\dfrac{1}{6}+\dfrac{2}{5}=\dfrac{17}{30}\)
câu 5)
\(\dfrac{3}{5}+\left(-\dfrac{7}{4}\right)=-\dfrac{23}{20}\)
câu 6)
\(\left(-2\right)+\left(\dfrac{-5}{8}\right)=\dfrac{-21}{8}\)
câu 7)
\(\dfrac{1}{-8}+\left(-\dfrac{5}{9}\right)=-\dfrac{49}{72}\)
câu 8)
\(\dfrac{4}{13}+\dfrac{12}{39}=\dfrac{8}{13}\)
câu 9)
\(\dfrac{1}{21}+\dfrac{1}{28}=\dfrac{1}{12}\)
câu 10)
\(-\dfrac{3}{29}+\dfrac{16}{58}=\dfrac{5}{29}\)
câu 11)
\(\dfrac{8}{40}+\left(-\dfrac{36}{45}\right)=-\dfrac{3}{5}\)
câu 12)
\(-\dfrac{8}{18}+\left(-\dfrac{15}{27}\right)=-1\)
câu 13)
\(\dfrac{13}{30}+\left(-\dfrac{1}{5}\right)=\dfrac{7}{30}\)
câu 14)
\(\dfrac{2}{21}+\dfrac{1}{28}=\dfrac{11}{84}\)
câu 15)
\(5+\left(-\dfrac{3}{4}\right)=\dfrac{17}{4}\)
câu 16)
\(\dfrac{18}{24}+\dfrac{45}{-10}=-\dfrac{15}{4}\)
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Thực hiện phép tính( tính hợp lí nếu có thể)
1) 14.25-28/7.19+28
2)27 3/5:12/5+12 2/5:2 2/5
3) 50%.1 1/3.10.7/35.0,75
4)2/3+1/3(-4/9+5/6):7/12
5) 2^2+10^3:10-(3^2.112:8-11).2005^0
6)[(6 3/5-3 3/14).5 5/6]:[(21-1,25):2,5]
7)2/3+2/7-1/14/-1-3/7+3/28
Mk ko ghi lại đề nhé
1 = \(350-4.19+4.7\)
\(=350-4.\left(19+7\right)\)
\(=350+4.26\)
\(=350-104=246\)
2 Câu này mình vẫn chưa hiểu là bạn ghi 27 3/5 tức là 27.3/5 hay 27\(\dfrac{3}{5}\)nên mk bỏ qua nhé
3 Cái đoạn 1 1/3 y chang câu 2 
4 \(=\dfrac{2}{3}+\dfrac{1}{3}.\dfrac{7}{18}.\dfrac{12}{7}\)
\(=\dfrac{2}{3}+\dfrac{7}{54}.\dfrac{12}{7}\)
\(=\dfrac{2}{3}+\dfrac{2}{9}=\dfrac{8}{9}\)
5 \(=2^2+10^2-\left[9.\left(112:8\right)-11\right].1\)
\(=4+100-\left(9.14-11\right)\)
\(=104-115\)\(=-11\)
6 Đoạn 6 3/5 y chang 2,3
7 \(=\left(\dfrac{2}{3}-1\right)+\left(\dfrac{2}{7}-\dfrac{3}{7}\right)-\left(\dfrac{1}{14}-\dfrac{3}{28}\right)\)
\(=\dfrac{-1}{3}+\dfrac{-1}{7}-\dfrac{-1}{28}\)
\(=\dfrac{-196}{588}+\dfrac{-84}{588}-\dfrac{-21}{588}\)\(=\dfrac{259}{588}\)
Làm tạm tạm thôi xl vì có 3 câu ko hiểu 
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tìm x thuộc z biết:
-2.(-x-5)+28=20-3.(x+4)
-29-9.(2x-1)2=-110
câu a) <=> 2x+10+28=20-3x-12
<=>5x=--30
<=>x=-6(TM)
câu b) chị ko bit em học hằng đt chưa nên để người khác giải nha ^^
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