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\(a.x+9=-7\)
\(x=-7-9\)
\(x=-16\)
\(b.x+51=19\)
\(x=19-51\)
\(x=-32\)
\(c.x-4=-8\)
\(x=-8+4\)
\(x=-4\)
\(d.41-x=-12\)
\(x=41-\left(-12\right)\)
\(x=53\)
\(e.|x|-2=5\)
\(|x|=7\)
\(\Rightarrow TH1:x=7\)
\(TH2:x=-7\)
\(f.|x-2|=5\)
\(\Rightarrow TH1:x-2=5\)
\(x=7\)
\(TH2:x-2=-5\)
\(x=-3\)
\(g.\left(x-5\right)\left(7+x\right)=0\)
\(TH1:x-5=0\)
\(x=5\)
\(TH2:7+x=0\)
\(x=-7\)
a) x+9=-7 b) x+51=19 c)x-4=8 x=8-4 x=4
x=-7-9 x=-16. x=19-51 x=-32
A) 7/38 x 9/11 +7/38 x 4/11 -7/38 x 2/11
=7/38.(9/11+4/11-2/11)
=7/38
B) 5/31 x 21/25 + 5/31 x -7/10 - 5/31 x 9/20
=5/31.(21/25-7/10-9/20)
=5/31.(-31/100)
=-1/20
a)7-3x=28
3x =7-28
3x =-21
x =-21:3
x =-7
b)12-x=13-(-4)
12-x=13+4
12-x=17
x=12-17
x=-5
c)15-2(x-1)=-3
2(x-1) =15+3
2(x-1) =18
x-1 =18:2
x =9+1
x =10
d)2x-(3+x)=5-7
2x-(3+x)=-2
3+x =2x+2
3+x-2 =2x
x+1 =2x
x+1 =x+x
=>x=1
#Chúc bạn học tốt#
k cho mk nha ,please!!!
a) 7 - 3x = 28
3x = 7 - 28
3x = -21
x = -21 : 3
x = -7
vậy x = -7
b) 12 - x = 13 -(-4)
12 - x = 17
x = 12 - 17
x = -5
vậy x = -5
c) 15 - 2 . (x - 1) = -3
2 . (x - 1) = 15 -(-3)
2 . (x - 1) = 18
x - 1 = 18 : 2
x - 1 = 9
x = 9 + 1
x = 10
vậy x = 10
d) 2x - (3 + x) = 5 - 7
2x - (3 + x) = -2
3 + x = 2x -(-2)
3 + x - 2 = 2x
x + 1 = 2x
x + 1 = x + x
=> x = 1
vậy x = 1
k cho mk nha
x - 7 = 15 - (-21)
x - 7 = 36
x = 36 + 7
x = 43
b) 3x + 17 = 2
3x = 2 - 17
3x = -15
x = -5
c) ( x - 9) = 45 - ( -35)
x - 9 = 80
x = 80 + 9
x = 89
a/ \(15-\left(x-7\right)=-21\)
\(15-x+7=-21\)
\(x=15-\left[\left(-21\right)-7\right]=15-\left(-28\right)=43\)
b/\(3x+17=2\)
\(3x=2-17=-15\)
\(x=-\frac{15}{3}=-5\)
c/\(45-\left(x-9\right)=-35\)
\(45-x+9=-35\)
\(x=45-\left[\left(-35\right)-9\right]=89\)
d/\(\left(-5\right)+x=15\)
\(x=15-\left(-5\right)=20\)
e/\(2x-\left(-17\right)=15\)
\(2x=15-17=-2\)
\(x=-\frac{2}{2}=-1\)
g/ \(Ix-2I=3\)
TH1: \(x-2=3\)
\(x=3+2=5\)
TH2: \(x-2=-3\)
\(x=\left(-3\right)+2=-1\)
=> \(x\in\left\{-1;5\right\}\)
bài 1
a. = -10/3
b. = 14/5
c = 1/9
p = 1/9
bài 2.
a. x= 271/75
b. x = 1/3
bài 2
a. x - 10/3 = 7/15 . 3/5
x - 10/3 = 7/25
x = 7/25 + 10/3
x = 271/75
b. 8/23 . 46/24 - x = 1/3
2/3 - x = 1/3
x = 2/3 - 1/3
x = 1/3
a) -15÷x=3
x=-15÷3
x=-5
b) -3x+8=-7
-3x . =-15
x. =-15÷-3
x. = 5
c) ( x-6) (7- x) =0
Suy ra: * x-6 =0=) x=6
*7-x=0=) x=7
Vậy x=6;7
a, -15:x=3
\(\Rightarrow x=-15:3\)
\(\Rightarrow x=-5\)
Vậy x=-5
b,-3x+8=-7
\(\Rightarrow-3x=-7-8\)
\(\Rightarrow-3x=15\)
\(\Rightarrow x=15:\left(-3\right)\)
\(\Rightarrow x=5\)
Vậy x=5
c, (x-6)(7-x)=0
\(\Rightarrow\orbr{\begin{cases}x-6=0\\7-x=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=0+6\\x=7-0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=6\\x=7\end{cases}}\)
Vậy \(\orbr{\begin{cases}x=6\\x=7\end{cases}}\)
\(a,x-\frac{3}{4}=\frac{1}{7}\)
\(x=\frac{1}{7}+\frac{3}{4}=\frac{25}{28}\)
\(b,\frac{15}{x}-\frac{1}{3}=\frac{28}{51}\)
\(\frac{15}{x}=\frac{28}{51}-\frac{1}{3}=\frac{15}{17}\)
\(\Rightarrow x=17\)
học tốt ~~~
\(x-\frac{3}{4}=\frac{1}{7}\)
\(x\) \(=\frac{1}{7}+\frac{3}{4}\)
\(x\) \(=\frac{4}{28}+\frac{21}{28}\)
\(x\) \(=\frac{4+21}{28}\)
\(x\) \(=\frac{25}{28}\)