9/14 - x/7 : 5/3 = 3/14 tim x
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\(\frac{9}{14}-\frac{x}{7}:\frac{5}{3}=\frac{3}{14}\Leftrightarrow\frac{9}{14}-\frac{3x}{35}=\frac{3}{14}\Leftrightarrow\frac{3x}{35}=\frac{3}{7}\Leftrightarrow3x=15\Leftrightarrow x=5\)
Ta có: \(\frac{3}{7}.\left|3x-2\right|=\frac{9}{14}\)
\(\Rightarrow\left|3x-2\right|=\frac{9}{14}:\frac{3}{7}=\frac{3}{2}\)
\(\Rightarrow\orbr{\begin{cases}3x-2=\frac{3}{2}\\3x-2=\frac{-3}{2}\end{cases}\Rightarrow\orbr{\begin{cases}3x=\frac{7}{2}\\3x=\frac{1}{2}\end{cases}\Rightarrow}\orbr{\begin{cases}x=\frac{7}{6}\\x=\frac{1}{6}\end{cases}}}\)
Vậy x = 7/6 hoặc x = 1/6
3/7.(3.x-2)=9/14 và = -9/14
3x-2= 9/14:3/7=3/2
x= (3/2+2) :3=7/6
với 3/7(3x-2)=-9/7
3x-2=-9/7 : 3/7=-3
x=(-3+2):3=-1/3
vậy x có hai giá trị 7/6 và -1/3
2.(x-5)-3.(x+7)=14
-> 2x-10-3x-21=14
->-x-31=14
->-x=45
->x=-45
9/5 : 7/4 + 3/4 x 8/7
= (9/5 : 8/7) x (7/4 + 3/4)
= 63/40 x 5/2
= 63/16
7 x 3/14 - 1/14
= 3/2 - 1/4
= 5/4
\(\dfrac{9}{5}:\dfrac{7}{4}+\dfrac{3}{4}\times\dfrac{8}{7}\)
\(=\dfrac{9}{5}\times\dfrac{4}{7}+\dfrac{3}{4}\times\dfrac{8}{7}\)
\(=\dfrac{36}{35}+\dfrac{6}{7}\)
\(=\dfrac{66}{35}\)
\(7\times\dfrac{3}{14}-\dfrac{1}{14}\)
\(=\dfrac{3}{2}-\dfrac{1}{14}\)
\(=\dfrac{10}{7}\)
4/5 x 15/11 x 2/9 = 8/33
4/7 x 2/5 + 4/7 x 3/5 = 4/7
( 5/7 + 7/8 ) x 2 = 89/28
2/14 + 3/7 - 3/14 x 2 = 1/7
tk mình nhé, mk nhanh nhất
Đề Bài :\(\frac{9}{14}\)- \(\frac{x}{7}\): \(\frac{5}{3}\)= \(\frac{3}{14}\)
ta có : \(\frac{9}{14}\)- \(\frac{x}{7}\)= \(\frac{3}{14}\)x \(\frac{5}{3}\)= \(\frac{5}{14}\)
\(\frac{x}{7}\)= \(\frac{9}{14}\)- \(\frac{5}{14}\)= \(\frac{4}{14}\)
\(\frac{4}{14}\)= \(\frac{x}{7}\)=> \(\frac{4}{14}\)= \(\frac{2}{7}\)=> x = 2
9/14-x/7:5/3=6/14
x/7:5/3=3/14
x/7=5/14
x=35/7
X = 35 thôi