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tìm x biết:
(3x-1) [- 1/2x+5]=0
1/4+1/3:(2x-1)=-5
[2x+3/5]2 - 9/25=0
-5(x+1/5)-1/2(x-2/3)=3/2x - 5 /6
[x+1/2]x [2/3-2x]=0
17/2-|2x-3/4|=-7/4
2/3x-1/2x =5/12
(x+1/5)2+17/25=26/25
[x.44/7+3/7].11/5-3/7=-2
3[3x-1/2]+1/9=0
Toán lớp 6Tìm x
Trả lời Câu hỏi tương tự
Chưa có ai trả lời câu hỏi này,bạn hãy là người đâu tiên giúp nguyenvanhoang giải bài toán này !
`@` `\text {Ans}`
`\downarrow`
`a)`
`(2x - 1)^2 + 1 = 26`
`\Rightarrow (2x - 1)^2 = 26 - 1`
`\Rightarrow (2x - 1)^2 = 25`
`\Rightarrow (2x - 1)^2 = (+-5)^2`
`\Rightarrow`\(\left[{}\begin{matrix}2x-1=5\\2x-1=-5\end{matrix}\right.\)
`\Rightarrow`\(\left[{}\begin{matrix}2x=6\\2x=-4\end{matrix}\right.\)
`\Rightarrow`\(\left[{}\begin{matrix}x=6\div2\\x=-4\div2\end{matrix}\right.\)
`\Rightarrow`\(\left[{}\begin{matrix}x=3\\x=-2\end{matrix}\right.\)
Vậy, `x \in`\(\left\{-2;3\right\}\)
`b)`
`(2x - 4)^3 + 2 = 66`
`\Rightarrow (2x - 4)^3 = 66 - 2`
`\Rightarrow (2x - 4)^3 = 64`
`\Rightarrow (2x - 4)^3 = 4^3`
`\Rightarrow 2x - 4 = 4`
`\Rightarrow 2x = 8`
`\Rightarrow x = 8 \div 2`
`\Rightarrow x = 3`
Vậy, `x = 3`
`c)`
\(7^{x+2}+5\cdot7^{x+1}+15=603\)
`\Rightarrow 7^x . 7^2 + 5 . 7^x . 7 = 603 - 15`
`\Rightarrow 7^x . 7^2 + 35 . 7^x = 588`
`\Rightarrow 7^x . (7^2 + 35) = 588`
`\Rightarrow 7^x . 84 = 588`
`\Rightarrow 7^x = 588 \div 84`
`\Rightarrow 7^x = 7`
`\Rightarrow 7^x = 7^1`
`\Rightarrow x = 1`
Vậy, `x = 1.`
\(#48Cd\)
\(a)\left(2x-1\right)^2+1=26\)
\(\left(2x-1\right)^2=25\)
\(TH1:2x-1=5\)
\(2x=6\)
\(x=3\)
\(TH2:2x-1=-5\)
\(2x=-4\)
\(x=-2\)
Vậy........
\(b)\left(2x-4\right)^3+2=66\)
\(\left(2x-4\right)^3=64=4^3\)
\(2x-4=4\)
\(2x=8\)
\(x=4\)
\(c)7^x+2+5.7^x+1+15=603\)
\(7^x\left(1+5\right)=603-15-1-2\)
\(7^x.6=585\)
Bạn xem lại phần này nhé . x tìm ra không được chẵn lắm á cậu.
a, (19-51)-(x-23)=-6
19-51-x+23=-6
-32-x+23=-6
-32-x=-6-23
-32-x=-29
x=-32+(-29)
x=-61
-5x-10(-7)=55
-5x+70=55
-5x=55-70
-5x=-15
x=-15:(-5)
x=3
c, -7-2x=-37-(-26)
-7-2x=-37+26
-7-2x=11
-2x=11+7
-2x=18
x=-9
d, /2x-1/=/-5/
2x-1=5
2x=5+1
2x=6
x=6:2
x=3
e, 2-/x+5/=7
2-x+5=7
2-x=7-5
2-x=2
x=2-2
x=0
h, (x+8)2=25
(x+8)2=52
x+8=5
x=5-8
x=-3
f, (x+3)3:3-1=-10
(x+3)3:3=-10+1
(x+3)3:3=-9
(x+3)3:3=33
x+3:3=3
x+3=9
x=9-3
x=6
k mk nhe
a) \(\dfrac{2}{3}x-\dfrac{1}{2}=\dfrac{1}{10}\)
\(\dfrac{2}{3}x=\dfrac{1}{10}+\dfrac{1}{2}=\dfrac{3}{5}\)
\(x=\dfrac{3}{5}:\dfrac{2}{3}=\dfrac{9}{10}\)
b) \(\dfrac{39}{7}:x=13\)
\(x=\dfrac{\dfrac{39}{7}}{13}=\dfrac{3}{7}\)
c) \(\left(\dfrac{14}{5}x-50\right):\dfrac{2}{3}=51\)
\(\dfrac{14}{5}x-50=51\cdot\dfrac{2}{3}=34\)
\(\dfrac{14}{5}x=34+50=84\)
\(x=\dfrac{84}{\dfrac{14}{5}}=30\)
d) \(\left(x+\dfrac{1}{2}\right)\left(\dfrac{2}{3}-2x\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x+\dfrac{1}{2}=0\\\dfrac{2}{3}-2x=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=-\dfrac{1}{2}\\x=\dfrac{1}{3}\end{matrix}\right.\)
e) \(\dfrac{2}{3}x-\dfrac{1}{2}x=\dfrac{5}{12}\)
\(\dfrac{1}{6}x=\dfrac{5}{12}\)
\(x=\dfrac{5}{12}:\dfrac{1}{6}=\dfrac{5}{2}\)
g) \(\left(x\cdot\dfrac{44}{7}+\dfrac{3}{7}\right)\dfrac{11}{5}-\dfrac{3}{7}=-2\)
\(\left(x\cdot\dfrac{44}{7}+\dfrac{3}{7}\right)\cdot\dfrac{11}{5}=-2+\dfrac{3}{7}=-\dfrac{11}{7}\)
\(x\cdot\dfrac{44}{7}+\dfrac{3}{7}=-\dfrac{11}{7}:\dfrac{11}{5}=-\dfrac{5}{7}\)
\(\dfrac{44}{7}x=-\dfrac{5}{7}-\dfrac{3}{7}=-\dfrac{8}{7}\)
\(x=-\dfrac{8}{7}:\dfrac{44}{7}=-\dfrac{2}{11}\)
h) \(\dfrac{13}{4}x+\left(-\dfrac{7}{6}\right)x-\dfrac{5}{3}=\dfrac{5}{12}\)
\(\dfrac{25}{12}x-\dfrac{5}{3}=\dfrac{5}{12}\)
\(\dfrac{25}{12}x=\dfrac{5}{12}+\dfrac{5}{3}=\dfrac{25}{12}\)
\(x=1\)
Mỏi tay woa bn làm nốt nha!!
-7-2x = 37-(-26)
Suy ra -7-2x=11
Suy ra -2x=11-7
Suy ra -2x=4
Suy ra 2x= -4
Suy ra x = -4 :2 =-2
26-3(2x-3)^2=-7^2
26-3(2x-3)^2+7^2=0
-12x^2+36x+48=0
-12(x-4)(x+1)=0
x-4=0 và x+1=0
x=4 và x=-1