a)(3^2)^2-(-2^3)^2-(5^2)^2
b)2^3+3.(1/2)^0-(1/2)^2.4+[(-2)^2:1/2]:8
các bn giúp mik vs mik cần gấp
tìm x biết:
a)2/3x-3/2x=5/12
b)2/5+3/5.(3x-3,7)=-53/10
c)7/9:(2+3/4x)+5/9=23/27
d)-2/3.x+1/5=3/10
e)|x|-3/4=5/3
f)|2x-1/3|+5/6=1
giúp mik vs mik đang cần gấp bn nào giải mik cũng tick nha
giải hết giúp mik các bn nhé
a; \(\dfrac{2}{3}\)\(x\) - \(\dfrac{3}{2}\)\(x\) = \(\dfrac{5}{12}\)
(\(\dfrac{2}{3}\) - \(\dfrac{3}{2}\))\(x\) = \(\dfrac{5}{12}\)
- \(\dfrac{5}{6}\)\(x\) = \(\dfrac{5}{12}\)
\(x\) = \(\dfrac{5}{12}\) : (- \(\dfrac{5}{6}\))
\(x=\) - \(\dfrac{1}{2}\)
Vậy \(x=-\dfrac{1}{2}\)
b; \(\dfrac{2}{5}\) + \(\dfrac{3}{5}\).(3\(x\) - 3,7) = \(\dfrac{-53}{10}\)
\(\dfrac{3}{5}\).(3\(x\) - 3,7) = \(\dfrac{-53}{10}\) - \(\dfrac{2}{5}\)
\(\dfrac{3}{5}\).(3\(x\) - 3,7) = - \(\dfrac{57}{10}\)
3\(x\) - 3,7 = - \(\dfrac{57}{10}\) : \(\dfrac{3}{5}\)
3\(x\) - 3,7 = - \(\dfrac{19}{2}\)
3\(x\) = - \(\dfrac{19}{2}\) + 3,7
3\(x\) = - \(\dfrac{29}{5}\)
\(x\) = - \(\dfrac{29}{5}\) : 3
\(x\) = - \(\dfrac{29}{15}\)
Vậy \(x\) \(\in\) - \(\dfrac{29}{15}\)
c; \(\dfrac{7}{9}\) : (2 + \(\dfrac{3}{4}\)\(x\)) + \(\dfrac{5}{9}\) = \(\dfrac{23}{27}\)
\(\dfrac{7}{9}\): (2 + \(\dfrac{3}{4}\)\(x\)) = \(\dfrac{23}{27}\) - \(\dfrac{5}{9}\)
\(\dfrac{7}{9}\):(2 + \(\dfrac{3}{4}\)\(x\)) = \(\dfrac{8}{27}\)
2 + \(\dfrac{3}{4}\)\(x\) = \(\dfrac{7}{9}\) : \(\dfrac{8}{27}\)
2 + \(\dfrac{3}{4}\)\(x\) = \(\dfrac{21}{8}\)
\(\dfrac{3}{4}x\) = \(\dfrac{21}{8}\) - 2
\(\dfrac{3}{4}\)\(x\) = \(\dfrac{5}{8}\)
\(x\) = \(\dfrac{5}{8}\) : \(\dfrac{3}{4}\)
\(x\) = \(\dfrac{5}{6}\)
Vậy \(x=\dfrac{5}{6}\)
a, || 3x - 1| + 1/2|= 7/2
b, ||1/2x +1|-3/4|= 5/4
c,||2x - 5|-7|=3
d,|5-4x| +|7y-3|=0
Mn giúp mik vs mik đang cần gấp bạn nào giải giúp mik, mik sẽ tuck cho bạn đó
Mik sẽ k cho bạn đó mik viết nhầm
tìm x
a,-2(x+7)+3(x-2)=-2
b,(x+3)3:3-1=-10
c,(x+1)2(x2+1)=0
các bn giúp mik nha,mik đang cần gấp
\(a,-2\left(x+7\right)+3\left(x-2\right)=-2\)
\(-2x-14+3x-6=-2\)
\(-2x+3x=-2+14+6\)
\(x=18\)
\(b,\left(x+3\right)^3:3-1=-10\)
\(\left(x+3\right)^3:3=-9\)
\(\left(x+3\right)^3=-27\)
\(\left(x+3\right)^3=\left(-9\right)^3\)
\(\Rightarrow x+3=9\)
\(\Rightarrow x=6\)
\(c,\left(x+1\right)^2\left(x^2+1\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x+1=0\\x^2+1=0\end{cases}\Rightarrow\orbr{\begin{cases}x=-1\\x^2=1\end{cases}\Rightarrow}\orbr{\begin{cases}x=-1\\x=1or-1\end{cases}}}\)
ko bt câu c này kl thế nào lun
a, 6,5 - 9/4 :| x + 1/3 |= 2
b, 11/4 + 3/2: | 4x - 1/ 5|= 7/2
c, 15/4 - 2,5 :| 3/4x + 1/2|= 3
Mn giúp mik vs mik đang cần gấp
(2|x|+1).(8x^(3)+1)=0
(x^2-4)^2=|x+2|=0
giúp mik vs,mik cần gấp;-;;;
tìm x biết
a,(x-2)^2-(x+3)^2-4(x+1)=5
b, (2x-3)(2x+3)-(x-1)^2-3x(x-5)=-44
c, (5x+1)^2-(5x+3)(5x-3)=30
d,(x+3)^2+(x-2)(x+2)-2(x-1)^2=7
giúp mik vs mik cần gấp
a, 1,5 +|2x - 2/3| = 3/2
b, 3/4 - |1/4 - x| = 5/8
c, 3 + | x+2 | = 2
Mn giải giúp mik vs mik đang cần gấp bạn nào giải giúp mik mik sẽ tick cho bạn đó
a, 1,5 +|2x - 2/3| = 3/2
|2x - 2/3| = 3/2 - 1,5
|2x - 2/3| = 0
<=> 2x - 2/3 = 0
<=> 2x = 0 + 2/3
<=> 2x = 2/3
<=> x = 2/3 : 2
<=> x = 1/3
Vậy x = 1/3
b, 3/4 - |1/4 - x| = 5/8
|1/4 - x| = 3/4 - 5/8
|1/4 - x| = 1/8
<=> 1/4 - x = 1/8
1/4 - x = /1/8
<=> x = 1/4 - 1/8
x = 1/4 - ( -1/8)
<=> x = 1/8
x = 3/8
Vậy x thuộc { 1/8 ; 3/8 }
c, 3 + | x+2 | = 2
| x+2 | = 2 - 3
| x+2 | = -1
<=> x + 2 = -1
x + 2 = 1
<=> x = -1 - 2
x = 1 -2
<=> x = -3
x = -1
Vậy x thuộc { -3 ; -1 }
Giải phương trình:
a) x+x/x-3+x-2//x+3=2(x^2+6)/x^2-9
b) 2-x/x-1+x-3/x+1=-2x/x^2/x^2-1
Giúp mik vs ạ mik cần gấp
Bạn nên dùng công thức trực quan cho bài toán như thế này nhé.
1+1*2+2*3+3...........*39+39*40+40
S=
giúp mik vs các bn ơi mik đang cần gấp ak
ta có: \(S=1+1\times2+2\times3+3\times4+...+38\times39+39\times40+40\)
\(\Rightarrow3S=1\times3+1\times2\times3+2\times3\times3+...+39\times40\times3+40\times3\)
\(3S=3+1\times2\times\left(3-0\right)+2\times3\times\left(4-1\right)+...+39\times40\times\left(41-38\right)+120\)
\(3S=3+1\times2\times3+2\times3\times4-1\times2\times3+...+39\times40\times41-38\times39\times40+120\)
\(3S=\left(3+1.2.3+...+39.40.41+120\right)-\left(1.2.3+...+38.38.40\right)\)
\(3S=3+39.40.41+120\)
\(\Rightarrow S=\left(3+39.40.41+120\right):3\)
\(S=21361\)