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\(\frac{13}{14}+\frac{13}{35}+\frac{13}{65}+...+\frac{13}{1274}-x+2\frac{1}{5}=0\)
\(\frac{26}{28}+\frac{26}{70}+\frac{26}{130}+...+\frac{26}{2548}-x+2\frac{1}{5}=0\)
\(\frac{26}{3}.\left(\frac{3}{4.7}+\frac{3}{7.10}+\frac{3}{10.13}+...+\frac{3}{49.52}\right)-x+2\frac{1}{5}=0\)
\(\frac{26}{3}.\left(\frac{1}{4}-\frac{1}{7}+\frac{1}{7}-\frac{1}{10}+\frac{1}{10}-\frac{1}{13}+...+\frac{1}{49}-\frac{1}{52}\right)-x+2\frac{1}{5}=0\)
\(\frac{26}{3}.\left(\frac{1}{4}-\frac{1}{52}\right)-x+2\frac{1}{5}=0\)
\(\Rightarrow\frac{21}{5}-x=0\rightarrow x=\frac{21}{5}\)
a: =152,3+7,7+2021,19-2021,19
=160
b: =7/15*3/14*20/13
\(=\dfrac{7}{14}\cdot\dfrac{3}{15}\cdot\dfrac{20}{13}=\dfrac{1}{2}\cdot\dfrac{1}{5}\cdot\dfrac{20}{13}=\dfrac{2}{13}\)
c: \(=\dfrac{7}{4}\left(\dfrac{13}{12}-\dfrac{10}{12}\right)+\dfrac{5}{6}=\dfrac{7}{16}+\dfrac{5}{6}=\dfrac{61}{48}\)
1/13.(8/13-5/13)+14/13
1/13.3/13+14/13
3/13+14/13
17/13
NHƯ VẦY ĐÓ BẠN MIK CŨNG HỌC LỚP 6 NHƯ BẠN ĐÓ
{50:5-45:5}x7
={10-9}x7
=1x7
=7
d,
=6^2x10:{780:[1000-15,625+35x14]}
=6^2x10:{780:[1000-15,625+490]}
=6^2x10:{780:1474,375}
=6^2x10:0,52903772785
=36x10:0,52903772785
=360:0,52903772785
=608,480769232
khum bt câu d, làm đúng chưa?
chắc sai á
1) 42/35 - [ 33/14 . 21/22 - ( 54/25 : 27/25 - 7/10 )]
= 42/35 - ( 9/4-13/10)
=42/35-19/20
=1/4
2) a) 5/21 . x/34 = 35/102
x/34=35/102 : 5/21
x/34=49/34
=> x=34
Vậy x=34
b) 15/x . 21/13 = 45/91
15/x=45/91 : 21/13
15/x=15/49
=> x=49
Vậy x=49
