x - 25% . x = -4và1/5(hỗn số)
x - 25% . x = -4 và 1/5 (hỗn số )
25 % = 1/4
x - 1/4 x = - 21/5
x ( 1 - 1/4 ) = -21 /5
x.3/4 = -21/5
x =- 21/ 5 : 3/ 4
x = -21/5 . 4/3
x = - 28 /5
=> 75%.x = -4 và 1/5
=> x = -4 và 1/5 : 75%
x = 84/15
A=(6 : 3/5 — 1và1/6 ×6/7) :(4và1/5×10/11+5/11)
B=5và9/10 : 3/2 — (2và1/3×4và1/2—2×2và2/1)
-9/46 - 4và1/23 : (3và1/4 - x : 3/5)+2và8/23=1
giúp mik nha mọi người,làm xong mik cho like
\(-\frac{9}{46}-4\frac{1}{23}:\left(3\frac{1}{4}-x:\frac{3}{5}\right)+2\frac{8}{23}=1\)
=> \(-\frac{9}{46}-\frac{93}{23}:\left(\frac{13}{4}-x:\frac{3}{5}\right)+\frac{54}{23}=1\)
=> \(-\frac{9}{46}-\frac{93}{23}:\left(\frac{13}{4}-x:\frac{3}{5}\right)=1-\frac{54}{23}\)
=> \(-\frac{9}{46}-\frac{93}{23}:\left(\frac{13}{4}-x:\frac{3}{5}\right)=-\frac{31}{23}\)
=> \(\frac{93}{23}:\left(\frac{13}{4}-x:\frac{3}{5}\right)=-\frac{9}{46}-\left(-\frac{31}{23}\right)\)
=> \(\frac{93}{23}:\left(\frac{13}{4}-x:\frac{3}{5}\right)=-\frac{9}{46}+\frac{31}{23}=\frac{53}{46}\)
=> \(\frac{13}{4}-x:\frac{3}{5}=\frac{93}{23}:\frac{53}{46}\)
=> \(\frac{13}{4}-x:\frac{3}{5}=\frac{93}{23}\cdot\frac{46}{53}=\frac{186}{53}\)
=> \(x:\frac{3}{5}=\frac{13}{4}-\frac{186}{53}=-\frac{55}{212}\)
=> \(x=-\frac{55}{212}\cdot\frac{3}{5}=-\frac{33}{212}\)
Vậy : ....
Tìm x, biết:
(1/24.25+1/25.26+...+1/29.30).120+x :1/3=1/4
x-25%x=0.5
50%x+5 1/4(hỗn số)x-2/3=2 5/6(hỗn số)
Tính bằng cách hợp lí nhất
6:3/5 - 1và1/6 x 6/7 / 4và1/5 x 10/11 + 5và2/11
4và2/5 + 5và6/9 + 2 và 3/4 + 3/5 + 1/3 + 1/4
mn giải giúp mình luôn nhé,cảm ơn mn ^_^
A=(6 : 35−116 x 67) : (415 x 1011+5211)A=(6 : 35−116 x 67) : (415 x 1011+5211)
A=(6 : 35−76 x 67) : (215 x 1011+5711)A=(6 : 35−76 x 67) : (215 x 1011+5711)
A=(10−1) : (4211+5711)A=(10−1) : (4211+5711)
A=9 : 9A=9 : 9
A=1
Tìm x biết:a) 10/x = -15/9; b) x/9 = -11/5 : 0,6; c) -7/8 - 2x = -3/4; d) (x-1/2):1/3+5/7=9và5/7; e)1/15.x+4/5.x=5và1/5; f) -1/3<x/6<1/2(x thuộc Z); h) 3/5+2/5:x=-1/4;i) 4 và 3/4x - 3 và 1/2=5/4; k)9/4.(1/3x-1/2)=4và1/2
Tìm x :
a, 1/4 + 1/3 : |2x - 1| = 11/12
b, 3/5 - (2 1/5 - x)^ 2 = 6/25 (có hỗn số và số mủ )
mn ơi giúp mình vs, mình cần gấp lắm, ai đúng mình k cho
Tìm X
a, 17/2 - |2x - 3/4| = -7/4
b, (x + 1/5)² + 17/25= 26/25
c, -1 5/27 - (3x -7/9)³ = -24/27
Phần c là -1 và 5/27 nhé (hỗn số)
`Answer:`
a. \(\frac{17}{2}-\left|2x-\frac{3}{4}\right|=-\frac{7}{4}\)
\(\Leftrightarrow\left|2x-\frac{3}{4}\right|=\frac{17}{2}+\frac{7}{4}\)
\(\Leftrightarrow\left|2x-\frac{3}{4}\right|=\frac{41}{4}\)
\(\Leftrightarrow\orbr{\begin{cases}2x-\frac{3}{4}=\frac{41}{4}\\2x-\frac{3}{4}=-\frac{41}{4}\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}2x=\frac{41}{4}+\frac{3}{4}\\2x=-\frac{41}{4}+\frac{3}{4}\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}2x=11\\2x=-\frac{19}{2}\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=11:2\\x=-\frac{19}{2}:2\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=\frac{11}{2}\\x=-\frac{19}{4}\end{cases}}\)
b. \(\left(x+\frac{1}{5}\right)^2+\frac{17}{25}=\frac{26}{25}\)
\(\Leftrightarrow\left(x+\frac{1}{5}\right)^2=\frac{26}{25}-\frac{17}{25}\)
\(\Leftrightarrow\left(x+\frac{1}{5}\right)^2=\frac{9}{25}\)
\(\Leftrightarrow\left(x+\frac{1}{5}\right)=\left(\frac{3}{5}\right)^2\)
\(\Leftrightarrow\orbr{\begin{cases}x+\frac{1}{5}=\frac{3}{5}\\x+\frac{1}{5}=-\frac{3}{5}\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=\frac{3}{5}-\frac{1}{5}\\x=-\frac{3}{5}-\frac{1}{5}\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=\frac{2}{5}\\x=-\frac{4}{5}\end{cases}}\)
c. \(-1\frac{5}{27}-\left(3x-\frac{7}{9}\right)^3=-\frac{24}{27}\)
\(\Leftrightarrow-\frac{32}{27}-\left(3x-\frac{7}{9}\right)^3=-\frac{24}{27}\)
\(\Leftrightarrow\left(3x-\frac{7}{9}\right)^3=-\frac{32}{27}-\left(-\frac{24}{27}\right)\)
\(\Leftrightarrow\left(3x-\frac{7}{9}\right)^3=-\frac{8}{27}\)
\(\Leftrightarrow\left(3x-\frac{7}{9}\right)^3=\left(-\frac{2}{3}\right)^3\)
\(\Leftrightarrow3x-\frac{7}{9}=-\frac{2}{3}\)
\(\Leftrightarrow3x=-\frac{2}{3}+\frac{7}{9}\)
\(\Leftrightarrow3x=\frac{1}{9}\)
\(\Leftrightarrow x=\frac{1}{9}:3\)
\(\Leftrightarrow x=\frac{1}{27}\)