Tìm x biết : \(26+5x=3x-56\)
Tìm x, biết:
a) 26 + 5x = 3x + 56
a)26 + 5x = 3x + 56
5x – 3x = 56 – 26
2x = 30
x = 30 : 2 = 15
Tìm x, biết:
1.26 + 5x = 3x +56
26 + 5x = 3x + 56
5x – 3x = 56 – 26
2x = 30
x = 30 : 2 = 15
26+5x=3x-56
b, 8x=7,8x+25
26+5x=3x-56 8x=7,8x+25
8x-7,8x=25
0,2x=25
x=24,8
26+56=3x-5x
82=-2x
x=-41
Tìm x biết:
a) |3x - 6| + |7x - 14| = 50
b) |12 - 3x| + |5x - 20| = 56
c) |x - 2| + |x + 3| - |3x - 5| = 4 (x > 2)
a: =>10|x-2|=50
=>|x-2|=5
=>x-2=5 hoặc x-2=-5
=>x=7 hoặc x=-3
b: =>|3x-12|+|5x-20|=56
=>8|x-4|=56
=>|x-4|=7
=>x-4=7 hoặc x-4=-7
=>x=11 hoặc x=-3
tìm x biết:
a)x2 + 3x = 0 b) x3 – 4x = 0
c) 5x(x-1) = x-1 d) 2(x+5) - x2-5x = 0
e) 2x(x-5)-x(3+2x)=26 f) 5x.(x – 2012) – x + 2012 = 0
a) \(\Rightarrow x\left(x+3\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=0\\x=-3\end{matrix}\right.\)
b) \(\Rightarrow x\left(x^2-4\right)=0\Rightarrow x\left(x-2\right)\left(x+2\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=0\\x=2\\x=-2\end{matrix}\right.\)
c) \(\Rightarrow\left(x-1\right)\left(5x-1\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=1\\x=\dfrac{1}{5}\end{matrix}\right.\)
d) \(\Rightarrow2\left(x+5\right)-x\left(x+5\right)=0\Rightarrow\left(x+5\right)\left(2-x\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=-5\\x=2\end{matrix}\right.\)
e) \(\Rightarrow2x^2-10x-3x-2x^2=26\)
\(\Rightarrow-13x=26\Rightarrow x=-2\)
f) \(\Rightarrow\left(x-2012\right)\left(5x-1\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=2012\\x=\dfrac{1}{5}\end{matrix}\right.\)
26+5x=3x-56
60% x+0,4x+x :3= 2
6 = 2
2x+1 7
Tìm x :
a,245-X=27
b,3X+41=56
c,238:2X=17
d,3X-90=24
e,2X:5=124
f,7X+4X=110
g,5X-X=444
h,26+3X=25+46
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a) 245 - x = 27 b) 3x + 41 = 56 c) 238: 2x = 17 d) 3x - 90 = 24 e) 2x:5 = 124 h) 26 + 3x = 25 + 46
x = 245 - 27 3x = 56 -41 2x = 238: 17 3x = 24 + 90 2x = 124.5 6 + 3x = 71
x = 218 3x = 15 2x = 14 3x = 114 2x = 620 3x = 71 - 6
x = 15 : 3 x = 14: 2 x = 114: 3 x = 620:2 3x = 65
x = 5 x = 7 x = 38 x = 310 x = 65: 3
x = 21,66
\(a,245-x=27\)
\(x=245-27\)
\(x=218\)
\(b,3x+41=56\)
\(3x=56-41\)
\(3x=15\)
\(x=15:3\)
\(x=5\)
\(c,238:2x=17\)
\(2x=238:17\)
\(2x=14\)
\(x=14:2\)
\(x=7\)
\(d,3x-90=24\)
\(3x=24+90\)
\(3x=114\)
\(x=114:3\)
\(x=38\)
\(e,2x:5=124\)
\(2x=124\times5\)
\(2x=620\)
\(x=620:2\)
\(x=310\)
\(f,7x+4x=110\)
\(\left(7+4\right)x=110\)
\(11x=110\)
\(x=110:11\)
\(x=10\)
\(g,5x-x=444\)
\(\left(5-1\right)x=444\)
\(4x=444\)
\(x=444:4\)
\(x=111\)
\(h,26+3x=25+46\)
\(26+3x=71\)
\(3x=71-26\)
\(3x=45\)
\(x=45:3\)
\(x=15\)
Học tốt
Tìm x biết
A) (47×48-30+40×0,25-47×1717)×(26-x)=160
B)3x+5x-1x=72
Bài 2:Cho 5x=8y Tìm x,y biết a) x+y=26 b)x-y=30 c)3x+2y=68 d) 4x-3y=34
bài :3Cho 2x+1/3=4y+3/9 Tìm x,y biết 3x-5y=18
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