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Cách giải
X = 8/9 / ( 1+1/3+1/6+1/10+1/15+1/21)
1+1/3=4/3
4/3+1/6=3/2
3/2+1/10=8/5
8/5+1/15=5/3
5/3+1/21=12/7
4/3+3/2=17/6
8/5+5/3=49/15
(17/6+49/15)+17/6=183/30+17/6=286/30
8/9:286/30=2288/270=1140/135=228/27=76/9
X = 76/9
\(x+\frac{3}{4}=\frac{1}{2}.\frac{2}{3}\)
\(x+\frac{3}{4}=\frac{2}{6}\)
\(x=\frac{2}{6}-\frac{3}{4}\)
\(x=\frac{-5}{12}\)
x+3/4=1/2.2/3
x+3/4=1/3
x=1/3-3/4
x=-5/12
k mik nhoa!!!!!!!!!!!!!!!!!
=> x + 1/2 = 5/6 + 3/4
=> x + 1/2 = 19/12
=> x = 19/12 - 1/2
=> x = 13/12
Vậy x = 13/12
Tk mk nha
a X+1/2-3/4=5/6 suy ra : Mỉnh phải đi ngủ rồi mai mình giải tiếp cho nhé
X+1/2=5/6+3/4
X+1/2=19/12
X=19/12-1/2
X=13/12
\(a,\frac{5}{6}+x\)x \(\frac{3}{4}=3\)
\(x\)x \(\frac{3}{4}=3-\frac{5}{6}\)
\(x\)x \(\frac{3}{4}=\frac{13}{6}\)
\(x=\frac{13}{6}:\frac{3}{4}\)
\(x=\frac{26}{9}\)
b, \(5\frac{1}{6}-x:\frac{3}{4}=\frac{2}{3}\)
\(\frac{31}{6}-x:\frac{3}{4}=\frac{2}{3}\)
\(x:\frac{3}{4}=\frac{31}{6}-\frac{2}{3}\)
\(x:\frac{3}{4}=\frac{9}{2}\)
\(x=\frac{9}{2}\)x \(\frac{3}{4}\)
\(x=\frac{27}{8}\)
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Thank you!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
X + 3/8=4/3
x =4/3-3/8
x =23/24
X x 1/9=21/8
X =21/8:1/9
X =7/24
X-5/4=7/6
X =7/6+5/4
X =21/8
X:8/3=5
X =5x8/3
X =40/3
Duyệt nha!
\(\left(\frac{1}{3.5}+\frac{1}{5.7}+\frac{1}{7.9}+....+\frac{1}{19.21}\right).x=\frac{9}{7}\)
\(\left(\frac{5-3}{3.5}+\frac{7-5}{5.7}+\frac{9-7}{7.9}+...+\frac{21-19}{19.21}\right).x=\frac{9}{7}\)
\(\left[\frac{1}{2}.\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}+...+\frac{1}{19}-\frac{1}{21}\right)\right].x=\frac{9}{7}\)
\(\left[\frac{1}{2}.\left(\frac{1}{3}-\frac{1}{21}\right)\right].x=\frac{9}{7}\)
\(\left[\frac{1}{2}.\frac{2}{7}\right].x=\frac{9}{7}\)
\(\frac{1}{7}.x=\frac{9}{7}\)
\(\Rightarrow x=\frac{9}{7}\div\frac{1}{7}=9\)
\(\left(\frac{1}{3.5}+\frac{1}{5.7}+\frac{1}{7.9}+...+\frac{1}{19.21}\right)x=\frac{9}{7}\)
\(\Leftrightarrow\left(\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+...+\frac{1}{19}-\frac{1}{21}\right)x=\frac{9}{7}\)
\(\Leftrightarrow\left(\frac{1}{3}-\frac{1}{21}\right)x=\frac{9}{7}\)
\(\Leftrightarrow\frac{2}{7}x=\frac{9}{7}\)
\(\Leftrightarrow x=\frac{9}{2}\)
ta gọi 1/x là Y
2/5=4/10
3/5=6/10
=>4/10<Y<6/10=>Y=5/10=1/2
=>X=2
Ta có \(\frac{2}{5}< \frac{1}{x}< \frac{3}{5}\)
\(\Rightarrow\frac{2.3}{5.3}< \frac{1.6}{6.x}< \frac{3.2}{5.2}\)
\(\Rightarrow\frac{6}{15}< \frac{6}{6x}< \frac{6}{10}\)
\(\Rightarrow15>6x>10\)
\(\Rightarrow6x=12\Rightarrow x=2\)
\(x\cdot\frac{1}{3}:\frac{2}{5}=\frac{4}{3}\)
\(\Rightarrow x\cdot\frac{1}{3}=\frac{4}{3}\cdot\frac{2}{5}\)
\(\Rightarrow x\cdot\frac{1}{3}=\frac{8}{15}\)
\(\Rightarrow x=\frac{8}{15}:\frac{1}{3}\)
\(\Rightarrow x=\frac{8}{5}\)
Vậy x=........
\(x.\frac{1}{3}:\frac{2}{5}=\frac{4}{3}\)
\(x.\frac{1}{3}=\frac{4}{3}x\frac{2}{5}=\frac{8}{15}\)
\(x=\frac{8}{15}:\frac{1}{3}=\frac{8}{5}\)
học tốt
44/60 : 1/3
11/5