707 x 28 =
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12 tháng 4 2017
\(\frac{2}{7}\)x \(\left(\frac{707}{202}+\frac{707}{3030}+\frac{707}{4242}+\frac{707}{5656}+\frac{707}{7272}\right)\)
\(=\frac{2}{7}\)x \(\left(\frac{7}{2}+\frac{7}{30}+\frac{1}{6}+\frac{1}{8}+\frac{7}{72}\right)\)
\(=\frac{2}{7}\)x \(\left(\frac{1260}{360}+\frac{84}{360}+\frac{60}{360}+\frac{45}{360}+\frac{35}{360}\right)\)
\(=\frac{2}{7}\)x \(\frac{371}{90}=\frac{53}{45}\)
17 tháng 1 2024
Số số hạng là: \(\dfrac{770-7}{7}+1=110-1+1=110\left(số\right)\)
Tổng của dãy số là:
\(\left(770+7\right)\cdot\dfrac{110}{2}=42735\)
NN
29 tháng 11 2017
a) \(\left(-396\right)+2016+189+\left(-604\right)-109\)
\(=-396+2016+189-604-109\)
\(=-\left(396-2016\right)+189-604-109\)
\(=-\left(-1620\right)+189-604-109\)
\(=1620+189-604-109\)
\(=1809-604-109\)
\(=1205-109\)
\(=1096\)
b) \(10-\left|x+3\right|=-8-10\)
\(\Leftrightarrow10-\left|x+3\right|=-\left(8+10\right)\)
\(\Leftrightarrow10-\left|x+3\right|=-18\)
\(\Leftrightarrow\left|x+3\right|=10-\left(-18\right)\)
\(\Leftrightarrow\left|x+3\right|=10+18\)
\(\Leftrightarrow\left|x+3\right|=28\)
Xét trường hợp 1: \(x+3=28\)
\(\Rightarrow x=28-3\)
\(\Rightarrow x=25\)
Xét trường hợp 2: \(x+3=-28\)
\(\Rightarrow x=-28-3\)
\(\Rightarrow x=-\left(28+3\right)\)
\(\Rightarrow x=-31\)
Vậy \(x=25\) hoặc \(x=-31\)
SV
Sinh Viên NEU
CTVVIP
14 tháng 10 2023
Question 28: His brother refuses to even listen to anyone else’s point of view. He is very .
A. narrow-minded B. kind-hearted C. open-minded D. absent-minded
Question 29: 507,507,707. Let’s the difference and say $607.
A. avoid B. split C. agree D. decrease
Question 30: When a European, we should stick to the last name unless he suggests that we use his first name.
A. speaking B. discussing C. talking D. addressing
Question 31: Certificates provide proof of your .
A. qualifications B. diplomas C. ambitions D. qualities
Question 32: Onion crisis is to arise in India. This demand-supply imbalance has resulted from the government’s inability to preserve the crop for non-harvesting seasons.
A. reputed B. known C. foreseen D. bound
Question 33: I don’t understand what these results .
A. significant B. significance C. signify D. significantly
Question 34: What can be drawn from the experiment of two American physicists, Clinton Davisson and Lester Germer?
A. conclusion B. attention C. contrast D. inference
Question 35: It seems that the thief took of the open window and got inside that way.
A. occasion B. chance C. opportunity D. advantage
PT
1
NH
6
LL
25 tháng 4 2018
\(\left(\frac{505}{707}+\frac{222}{333}\right)\cdot x=\frac{404}{909}\)
=> \(\left(\frac{5}{7}+\frac{2}{3}\right)\cdot x=\frac{4}{9}\)
=> \(\frac{29}{21}\cdot x=\frac{4}{9}\)
=> \(x=\frac{4}{9}:\frac{29}{21}\)
=> \(x=\frac{28}{87}\)
TK mk nha!
24 tháng 4 2018
( 505/707+ 222/333) . x = 404/ 909
29/21 . x = 4/9
x= 4/9 : 29/21
x= 4/9 . 21/29
x= 28/87
Vậy x= 28/87
BT
2
G
19 tháng 9 2017
Giải:
\(707-3\left(x+3^4\right)=407\)
\(\Leftrightarrow3\left(x+3^4\right)=300\)
\(\Leftrightarrow x+3^4=100\)
\(\Leftrightarrow x+81=100\)
\(\Leftrightarrow x=100-81=19\)
Vậy \(x=19\).
Chúc bạn học tốt!
19 tháng 9 2017
707 - 3 . ( x + 34 ) = 407
707 - 3 . ( x + 81 ) = 407
3 . (x + 81) = 707 - 407
3 . (x + 81) = 300
x + 81 = 300 : 3
x + 81 = 100
x = 100 - 81
x = 9.
ES
0
707 X 28 = 19 796
:D
707 x 28 = 19 796
Đáp án nha bạn!