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a) \(\frac{1}{2}x+\frac{3}{5}\left(x-2\right)=3\)
0,5 x + 0,6 ( x - 2 ) = 3
0,5 x + 0.6 x - 1,2 = 3
1,1 x = 4,2
x = \(\frac{42}{11}\)
Kết luận:
b) \(\frac{1}{3}x-0,5x=0,75\)
\(\frac{1}{3}x-\frac{1}{2}x=\frac{3}{4}\)
\(-\frac{1}{6}x=\frac{3}{4}\)
\(x=-\frac{9}{2}\)
Kết luận:
c) \(\frac{3}{-2}x-0,5x=75\%\)
-1,5x - 0,5x = 0,75
-2x = 0,75
x = -0,375
Kết luận:
d) \(-\frac{2}{5}x+\frac{1}{4}=75\%-\frac{3}{4}x\)
-0,4 x + 0,25 = 0,75 - 0,75 x
-0,4 x + 0,75 x = 0,75 - 0,25
0,35 x = 0,5
x = \(\frac{10}{7}\)
Kết luận:
\(a,\frac{1}{2}x+\frac{3}{5}\left(x-2\right)=3\)
\(\frac{1}{2}x+\frac{3}{5}x-\frac{6}{5}=3\)
\(\left(\frac{1}{2}+\frac{3}{5}\right)x-\frac{6}{5}=3\)
\(\frac{11}{10}x-\frac{6}{5}=3\)
\(\frac{11}{10}x=\frac{21}{5}\)
\(x=\frac{42}{11}\)
\(b,\frac{1}{3}x-\frac{1}{2}x=\frac{3}{4}\)
\(\left(\frac{1}{3}-\frac{1}{2}\right)x=\frac{3}{4}\)
\(\frac{-1}{6}x=\frac{3}{4}\)
\(x=\frac{-9}{2}\)
\(c,\frac{3}{-2}x-\frac{1}{2}x=75\%\)
\(\left(\frac{3}{-2}-\frac{1}{2}\right)x=\frac{3}{4}\)
\(-2x=\frac{3}{4}\)
\(x=\frac{-3}{8}\)
\(\frac{-2}{5}x+\frac{1}{4}=75\%-\frac{3}{4}x\)
\(\frac{-2}{5}x+\frac{3}{4}x=\frac{3}{4}-\frac{1}{4}\)
\(\left(\frac{-2}{5}+\frac{3}{4}\right)x=\frac{1}{2}\)
\(\frac{7}{20}x=\frac{1}{2}\)
\(x=\frac{10}{7}\)
\(\frac{1}{3}x-0,5x=0,75\)
\(\Rightarrow-\frac{1}{6}x=0,75\)
\(\Rightarrow x=-\frac{9}{2}\)
\(\frac{1}{3}x-\frac{1}{2}x=\frac{3}{4}\)
\(\left(\frac{1}{3}+\frac{1}{2}\right)x=\frac{3}{4}\)
\(\frac{5}{6}x=\frac{3}{4}\)
\(x=\frac{3}{4}\div\frac{5}{6}\)
\(x=\frac{3}{4}\cdot\frac{6}{5}=\frac{9}{10}\)
\(#Cothanhkhe\)
[Giải:]
107 + ( 210 + x ) = 317
210 + x = 317 - 107
210 + x = 210
x = 210 - 210
x = 0
2x + (0,5 + 25%) = 0,75
2x + (0,5 + 0,25) = 0,75
2x + 0,75 = 0,75
2x = 0,75 - 0,75
2x = 0
x = 0 : 2
x = 0
4221 : (x - 16 ) = 21
x - 16 = 4221 : 21
x - 16 = 201
x = 201 + 16
x = 217
50% + 0,75x = 0,5
0,5 + 0,75x = 0,5
0,75x = 0,5 - 0,5
0,75x = 0
x = 0 : 0,75
x = 0
| - Câu khác làm tương tự - |
[ Hoq chắc ]
a, 107 + ( 210 - x ) = 317
210 - x = 317 - 107
210 - x = 210
x = 210 - 210
x = 0
Vậy x = 0
b, 2x + ( 0,5 + 25% ) = 0,75
2x + 0,75 = 0,75
2x = 0,75 - 0,75
2x = 0
x = 0
Vậy x = 0
c, 4221 : ( x - 16 ) = 21
x - 16 = 4221 : 21
x - 16 = 201
x = 201 + 16
x = 217
Vậy x = 217
d, 156 - ( x + 61 ) = 21
x + 61 = 156 - 21
x + 61 = 135
x = 135 - 61
x = 74
Vậy x = 74
e, ( 235 - x ) - 81 = 54
235 - x = 54 + 81
235 - x = 135
x = 235 - 135
x = 100
Vậy x = 100
f, 50% + 0,75. x = 0,5
0,75. x = 0,5 - 50%
0,75. x = 0
x = 0
Vậy x = 0
1/3.x-0,5.x=0,75
x(1/3-0,5) = 0,75
x.(-1/6)=0,75
x = -4,5
a: \(\left(\dfrac{3}{4}x+2\dfrac{1}{2}\right)\cdot\dfrac{-2}{3}=\dfrac{1}{8}\)
=>\(\left(\dfrac{3}{4}x+\dfrac{5}{2}\right)=\dfrac{1}{8}:\dfrac{-2}{3}=\dfrac{-3}{16}\)
=>\(\dfrac{3}{4}x=-\dfrac{3}{16}-\dfrac{5}{2}=-\dfrac{3}{16}-\dfrac{40}{16}=-\dfrac{43}{16}\)
=>\(x=-\dfrac{43}{16}:\dfrac{3}{4}=\dfrac{-43}{16}\cdot\dfrac{4}{3}=\dfrac{-43}{12}\)
b: \(\dfrac{1}{3}\cdot x-0,5x=0,75\)
=>\(x\left(\dfrac{1}{3}-\dfrac{1}{2}\right)=0,75\)
=>\(x\cdot\dfrac{-1}{6}=0,75\)
=>\(x=-0,75\cdot6=-4,5\)
a, \(\left(2x-1\right)^3=8\)
\(\Leftrightarrow\left(2x-1\right)^3=2^3\)
\(\Leftrightarrow2x-1=2\Leftrightarrow2x=3\Leftrightarrow x=\frac{3}{2}\)
b, \(\left(x-1\right)^x+2=\left(x-1\right)^x+4\)
\(\Leftrightarrow\left(x-1\right)^x+2-\left(x-1\right)^x-4=0\)
\(\Leftrightarrow-2\ne0\)=> vô nghiệm
c, \(3^x-1+5.3^{3x}-1=162\)
Đề sai.
X*(1/3-0.5)=0.75
X*-1/6=0.75
X=0.75/(-1/6)
X=-9/2
1/3*x-1/2*x=0,75.
(1/3-1/2)*x=3/4.
-1/6*x=3/4.
x=3/4:(-1/6).
x=-9/2.
Vậy x=-9/2.