Tim x :
a) -121-( -35 - x) =50
b) 17 + x - (352 - 400) = -32
c)2130 - ( x + 130) + 72 = - 64
d) |x| - 5 = -1
e) |x + 2| - 12 = -1
f) 135 - |9 - x| = 35
g) | x - 5| - 3| = 9
ai nhanh mik tik
Help me!!!!!!!!!!!!!
Tìm x biết:
a) (-x+31)-39=-69 b)-121-(35-x)=50
c)17+x-(352-400)=-32 d)2130-(x+130)+72=-64
e)|x|-5=-1 f)|x+2|-13=-1
g)135-|9-x|=35 h)||x-5|-3|=9
a) (-x + 31 ) - 39 = -69 => -x + 31 = -69 + 39 => -x = -30 + 31 => -x = -61 => x = 61
b) -121 - ( 35 - x ) = 50 => 35 - x = -121 - 50 => x = 35 - ( -171 ) => x = 206
c) 17 + x - ( 352 - 400 ) = -32 => 17 + x + 48 = -32 => x = -32 - 48 - 17 => x = -97
d) 2130 - ( x + 130 ) + 72 = -64 => 2130 - ( x + 130 ) = -64 - 72 => x + 130 = 2130 - ( -136 ) => x = 2266 - 130 => x = 2136
e) | x | - 5 = -1 => | x | = -1 + 5 => | x | = 4 => x = 4
f) | x + 2 | - 13 = -1 => | x + 2 | = -1 + 13 => x + 2 = 12 => x = 12 - 2 => x = 10
=> x + 2 = -12 => x = -12 - 2 => x = -14
g) 135 - | 9 - x | = 35 => | 9 - x | = 135 - 35 => 9 - x = 100 => x = 9 - 100 => x = -91
=> 9 - x = -100 => x = 9 - (-100) => x = 109
h) || x - 5 | - 3| = 9 => | x - 5 | - 3 = 9 => | x - 5 | = 9 + 3 => x - 5 = 12 => x = 12 + 5 => x = 17
=> x - 5 = -12 => x = -12 + 5 => x = -7
=> | x - 5 | - 3 = -9 => | x - 5 | = -9 + 3 => | x - 5 | = -6 ( loại )
Bài 2 Tìm X biết
8 ) | x + 12 | - 12 = 1
9 ) 135 - | 9- x | = 35
10) 17 + x - ( 352 - 400 ) = - 32
11) 2130 - ( x + 136 ) + 72 = - 64
12) ( x - 2 ) - ( -8 ) = - 137
13) 10 - | x + 3 | = - 4 . ( - 10 )
8 ) | x + 12 | - 12 = 1
\(|x+12|=13\)
\(\Rightarrow\orbr{\begin{cases}x+12=13\\x+12=-13\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=1\\x=-25\end{cases}}\)
Vậy \(x\in\left\{1;-25\right\}\)
9) 135 -\(|9-x|=35\)
\(|9-x|=135-35\)
\(|9-x|=100\)
\(\Rightarrow\orbr{\begin{cases}9-x=100\\9-x=-100\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=-91\\x=109\end{cases}}\) Vậy x\(\in\left\{-91;109\right\}\) 10) 17+x-(352-400)=-32 17+x-352+400=-32 17+x-352 =(-32) - 400 17+x-352 =-432 17+x =(-432) + 352 17+x =-80 x =(-80) - 17 x =-97 Vậy x =-97 11) 2130 - (x+136) + 72 =-64 2130 - (x+136) =(-64) -72 2130 - (x+136) =-136 (x +136) = 2130 -(-136) x+136 =2266 x =2266 - 136 x =2130 Vậy x=2130 do sap an cơm nên chiều mình sẽ giải tiếp nha! sorryy
12) (x-2) - (-8) = -137
(x-2) +8 =-137
(x-2) =(-137) - 8
x-2 =-145
Vậy x=-145
13) 10-\(|x+3|=-4.\left(-10\right)\) 10- \(|x+3|=40\) \(|x+3|=\) 40+10 \(|x+3|=50\)
\(\Rightarrow\orbr{\begin{cases}x+3=50\\x+3=-50\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=50-3\\x=\left(-50\right)-3\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=20\\x=-53\end{cases}}\)
Vậy x\(\in\left\{20;-53\right\}\)
các bạn giúp mình giải những bài này
a). ( 31-x)-39=-69
b).-121-(35-x)=50
c).17+x-(352-400)= -32
d).2130-(x+130)+72=-64
2130 - ( x +130) + 72 = - 64
l x l - 5 = -1
l x+2 l - 12 = -1
135 - (9 - x ) = 35
15 - ( -x +18 ) = -24
2130 - ( x + 130 ) + 72 = - 64
2202 - ( x + 130 ) = - 64
x + 130 = 2202 + 64
x + 130 = 2266
x = 2266 + 130
x = 2396
\(|x|-5=-1\)
\(|x|=-1+5\)
\(|x|=4\)
\(\Rightarrow\orbr{\begin{cases}x=4\\x=-4\end{cases}}\)
\(|x+2|-12=-1\)
\(|x+2|=-1+12\)
\(|x+2|=11\)
\(\Rightarrow\orbr{\begin{cases}x+2=11\\x+2=-11\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=11-2\\-x=-11-2\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=9\\x=-13\end{cases}}\)
135 - ( 9 - x ) = 35
135 - 9 + x = 35
126 + x = 35
x = 35 - 126
x = - 91
15 - ( -x + 18 ) = - 24
15 + x - 18 = - 24
- 3 + x = -24
x = - 24 + 3
x = - 21
Tìm x:
a/ 2130-(x+130)+72=-64
b/135-|9-x|=35
c/10-|x+3|=-4-(-10)
a/ 2130-(x+130)+72=-64
\(2130-\left(x+130\right)=-64-72\) \(2130-\left(x+130\right)=-136\)\(x+130=2130+136\)\(x+130=2266\)\(x=2266-130\)\(x=2136\)vậy x=2136
a/ 2130-(x+130)+72=-64
<=> -x-130+72+2130=-64
<=> x=2130+72-130+64=2136
b/135-|9-x|=35
<=> |9-x|=135-35=100
<=> \(\left[\begin{array}{nghiempt}9-x=100\\9-x=-100\end{array}\right.\)
<=>\(\left[\begin{array}{nghiempt}x=-91\\x=109\end{array}\right.\)
c/10-|x+3|=-4-(-10)
<=> |x+3|=10+4+(-10)
<=>|x+3|=4
<=>\(\left[\begin{array}{nghiempt}x+3=4\\x+3=-4\end{array}\right.\)
<=>\(\left[\begin{array}{nghiempt}x=1\\x=-7\end{array}\right.\)
c/10-|x+3|=-4-(-10)
Bài 6. Tìm x Z, sao cho:
a. (x – 3) – 12 = – 25
f. 121 – (35 – x) = 2.52
c. 72 – (84 – 9x) : 7 = 69
g. 2(17 + x) – (400 – 325) = – 31
d. (x + 7).(x – 5) =0
h. (x – 10).(x2 – 9) = 0
e. (x + 8).(x2 + 1) = 0
i. 17 – { – x + [– x – (– x)]} = – 16
a: \(\Leftrightarrow x-3=-13\)
hay x=-10
17+x-(352-400)=-32
-121-(-35-x)=50
||x-5|-3|=9
15-(-x+18)=-24
10-|x+3|=-4-(-10)
a) 17+x- (-8)=-32
=>x =-32+(-8)-17
=.x = -57
b) -121+35+x=50
=>x=50+121-35
=> x= 136
c)
có thể viết rõ hơn ko mình ko hiểu
(2x +3).(1/2.x - 3/2) = 0
(1/2 - x)2= 64/49
1/2.(x- 4/5 )=3/4.x = 5/12
ai nhanh mik tik cho
help me..........
a) \(\left(2x+3\right).\left(\frac{1}{2}.x-\frac{3}{2}\right)=0\)
\(\Rightarrow\orbr{\begin{cases}2x+3=0\\\frac{1}{2}.x-\frac{3}{2}=0\end{cases}}\) \(\Rightarrow\orbr{\begin{cases}2x=-3\\\frac{1}{2}.x=\frac{3}{2}\end{cases}}\Rightarrow\orbr{\begin{cases}x=-\frac{3}{2}\\x=\frac{3}{2}:\frac{1}{2}\end{cases}}\) \(\Rightarrow\orbr{\begin{cases}x=-\frac{3}{2}\\x=3\end{cases}}\)
Vậy x = \(-\frac{3}{2}\) hoặc x = 3
b)\(\left(\frac{1}{2}-x\right)^2=\frac{64}{49}\)
\(\Rightarrow\left(\frac{1}{2}-x\right)^2=\left(\frac{8}{7}\right)^2\) hoặc \(\left(\frac{1}{2}-x\right)^2=\left(-\frac{8}{7}\right)^2\)
\(\Rightarrow\orbr{\begin{cases}\frac{1}{2}-x=\frac{8}{7}\\\frac{1}{2}-x=-\frac{8}{7}\end{cases}}\Rightarrow\orbr{\begin{cases}x=\frac{1}{2}-\frac{8}{7}\\x=\frac{1}{2}+\frac{8}{7}\end{cases}}\Rightarrow\orbr{\begin{cases}x=-\frac{9}{14}\\x=\frac{23}{14}\end{cases}}\)
Vậy x = \(-\frac{9}{14}\) hoặc x = \(\frac{23}{14}\)
c) \(\frac{1}{2}.\left(x-4,5\right)=\frac{3}{4}.x=\frac{5}{12}\) ( câu này mik ko hiểu cho lắm)
k mik nha mn!