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675,4 - X x 2,5 = 0,4
X x 2,5 = 675,4 - 0,4
X x 2,5 = 675
X = 675 : 2,5
X = 27
chúc bạn HT
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\(3\dfrac{2}{5}\cdot1\dfrac{4}{7}=\dfrac{17}{5}\cdot\dfrac{11}{7}=\dfrac{187}{35}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{5}{7}+y\times\frac{1}{2}=\frac{8}{7}:\frac{3}{2}\)
=> \(\frac{5}{7}+y\times\frac{1}{2}=\frac{8}{7}\times\frac{2}{3}\)
=> \(\frac{5}{7}+y\times\frac{1}{2}=\frac{16}{21}\)
=> \(y\times\frac{1}{2}=\frac{16}{21}-\frac{5}{7}=\frac{1}{21}\)
=> \(y=\frac{1}{21}:\frac{1}{2}=\frac{1}{21}\cdot2=\frac{2}{21}\)
5/7 + Y x 1/2 = 8/7 : 3/2
=> 5/7 + Y x 1/2 = 16/21
=> Y x 1/2 = 16/21 - 5/7
=> Y x 1/2 = 1/21
=> Y = 1/21 : 1/2
=> Y = 2/21
Hok tốt ^^
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(15*24-x):0.25=100:1/4
=>(360-x):0.25=400
=>360-x=400*0.25
=>360-x=100
=>x=360-100
=>x=260
Vaayj x=260
( 15 x 24 - x ) : 0,25 = 100 : 1/4
( 360 - x ) : 1/4 = 100 x 4/1
( 360 - x ) : 1/4 = 400
360 - x = 400 x 1/4
360 - x = 100
x = 360 - 100
x = 260
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\(\left(1-\dfrac{1}{3}\right)\times\left(1-\dfrac{1}{4}\right)\times\left(1-\dfrac{1}{5}\right)\times\left(1-\dfrac{1}{6}\right)\times\dots\times\left(1-\dfrac{1}{99}\right)\times\left(1-\dfrac{1}{100}\right)\) (sửa đề)
\(=\dfrac{2}{3}\times\dfrac{3}{4}\times\dfrac{4}{5}\times\dfrac{5}{6}\times\dots\times\dfrac{98}{99}\times\dfrac{99}{100}\)
\(=\dfrac{2\times3\times4\times5\times\dots\times98\times99}{3\times4\times5\times6\times\dots\times99\times100}\)
\(=\dfrac{2}{100}\)
\(=\dfrac{1}{50}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
28 giờ 30 phút - y = 4 giờ 45 phút x 5
28 giờ 30 phút - y = 23 giờ 45 phút
y = 28 giờ 30 phút - 23 giờ 45 phút
y = 24 giờ 45 phút
K nha
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(x + 1) + (x + 5) + ( x + 4) + ...+ (x + 105) = 1485
x + (1 + 5 + 4 + ... + 105) = 1485
x + 115 = 1485
x = 1485 - 115
x = 1370
Nhớ k cho mik nha ^_^!!!