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2- X x 27/11 = 35/22
X x 27/11 =2-35/22
X x 27/11 =9/22
X =9/22:27/11
X =1/6
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Bài 1:
a) 19/27+9/7+6/27+5/7+2/7
= (19/27+6/27) + (9/7+5/7+2/7)
=1 + 16/7
=23/7
b) 2/7 + 27/48 + 7/16 +45/63
= (2/7 + 45/63) + (27/48 +7/16)
= (2/7 + 5/7) + ( 9/16 + 7/16)
= 1 + 1
=2
c) Tính bằng cách bình thường
Bài 2:
6/11 + x = 1
x = 1-6/11
x = 5/11
Bài làm
a) \(\frac{19}{27}+\frac{9}{7}+\frac{6}{27}+\frac{5}{7}+\frac{2}{7}\)
\(=\frac{27}{27}+\frac{16}{7}\)
\(=1+\frac{16}{7}\)
\(=\frac{7}{7}+\frac{16}{7}\)
\(=\frac{23}{7}\)
b) \(\frac{2}{7}+\frac{27}{48}+\frac{7}{16}+\frac{45}{63}\)
\(=\left(\frac{18}{63}+\frac{45}{63}\right)+\left(\frac{27}{48}+\frac{21}{48}\right)\)
\(=\frac{63}{63}+\frac{48}{48}\)
\(=1+1\)
\(=2\)
c) \(\frac{17}{23}+\left(\frac{4}{7}-\frac{6}{13}\right)\)
\(=\frac{17}{23}+\left(\frac{52}{91}-\frac{42}{91}\right)\)
\(=\frac{17}{23}+\frac{10}{91}\)
\(=\frac{1547}{2093}+\frac{230}{2093}\)
\(=\frac{1770}{2093}\)
Bài 2
\(\frac{6}{11}+x=1\)
\(x=1-\frac{6}{11}\)
\(x=\frac{11}{11}-\frac{6}{11}=\frac{5}{11}\)
Vậy \(x=\frac{5}{11}\)
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![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{1}{x}+\frac{2}{x}+\frac{3}{x}+.......+\frac{100}{x}=101\)
\(\Leftrightarrow\frac{1}{x}\left(1+2+3+....+100\right)=101\)
\(\Leftrightarrow\frac{1}{x}.\frac{100.\left(100+1\right)}{2}=101\)
\(\Leftrightarrow\frac{1}{x}.50=1\)
\(\Rightarrow\frac{1}{x}=\frac{1}{50}\)
\(\Rightarrow x=50\)
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X + \(\frac{5}{2}\)x \(\frac{2}{3}\)= \(\frac{5}{2}\)
X + \(\frac{5}{3}\) = \(\frac{5}{2}\)
X = \(\frac{5}{2}\)- \(\frac{5}{3}\)
X = \(\frac{5}{6}\)
~ Hok T ~
x + 5/2 x 2/3 = 5/2
x + 10/6 = 5/2
x = 5/2 - 10/6
x = 5/6
Ai trên 10 SP k tui ikkkkkkkk
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`(1 xx 2 xx 3 xx 4)/(3 xx 4 xx 5 xx 6)`
`= (1 xx 2)/(5 xx 6)`
`= 2/12`
`= 1/6`
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346 x 3005 - 3005 x 246
= 3005 x ( 346 - 246)
= 3005 x 100
= 300 500
346 x 3005 - 3005 x 246
= 3005 x ( 346 - 246)
= 3005 x 100
= 300 500
nhanh các bạn ơi
X x 27 - 178 = 15050
X x 27 = 15050 + 178
X x 27 = 15228
X = 15228 : 27
X = 564