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\(a,x+7=5-14\)
\(x+7=-9\)
\(x=-9-7\)
\(x=-16\)
\(b,-18-x=-8-13\)
\(-18-x=-21\)
\(x=-18+21\)
\(x=3\)
\(c,311-x+82=46+\left(x-21\right)\)
\(393-x=46+x-21\)
\(393-x=25+x\)
\(x+x=393-25\)
\(2x=368\)
\(x=184\)
\(d,\left|x-8\right|=7\)
\(\Rightarrow\orbr{\begin{cases}x-8=7\\x-8=-7\end{cases}\Rightarrow\orbr{\begin{cases}x=15\\x=1\end{cases}}}\)
\(f,12-x=25-\left(-7\right)\)
\(12-x=25+7\)
\(12-x=32\)
\(x=12-32\)
\(x=-20\)
\(g,-20+x=11-\left(-12\right)\)
\(-20+x=11+12\)
\(-20+x=23\)
\(x=23+20\)
\(x=43\)
\(h,-x-15=\left(-4\right)-\left(27-20\right)\)
\(-x-15=-11\)
\(x=-15+11\)
\(x=-4\)
\(i,15-\left(x-7\right)=-21\)
\(15-x+7=-21\)
\(22-x=-21\)
\(x=22+21\)
\(x=43\)
\(k,\left|x-3\right|+8=7\)
\(\left|x-3\right|=7-8\)
\(\left|x-3\right|=-1\)
\(TH1:x-3\ge0\Leftrightarrow x\ge3\)
\(\Rightarrow x-3=-1\)
\(\Rightarrow x=2\)( loại )
\(TH2:x-3< 0\Leftrightarrow x< 3\)
\(\Rightarrow-x+3=-1\)
\(\Rightarrow x=4\)( loại )
=> ko có giá trị nào cả
\(l,\left(x-2\right)\times\left(x+15\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-2=0\\x+15=0\end{cases}\Rightarrow\orbr{\begin{cases}x=2\\x=-15\end{cases}}}\)
\(m,-6x-\left(-7\right)=25\)
\(-6x+7=25\)
\(-6x=25-7\)
\(-6x=18\)
\(x=-3\)
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a) 35-15+x=70
=> 20+x=70
=> x=50
b) 568-(2x+14)=15
=> 2x+14=553
=> 2x=539
=> x=269,5
c) x-105:21=15
=> x-5=15
=> x=20
d) (x-105)*21=15
=> x-105=5/7
=> x=5/7+105
=> x=740/7
a, 35 - 15 + x = 70 b, 568 - (2.x + 14 )= 15
x = 70 - 35 + 15 2.x + 14 = 568 - 15
x = 50 2.x + 14 =553 => 2.x =553-14=539 =>x=539 : 2 =269.5
c, x - 105 : 21 =15 d, (x - 105) . 21 = 15
x - 105 = 15 x 21 x - 105 = 15 : 21
x - 105 = 315 x - 105 = \(\frac{5}{7}\)
x = 315+105 x = \(\frac{5}{7}\)+ 105
x = 420 x = \(\frac{740}{7}\)
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Nếu Bạn Hỏi thì Hỏi từ từ 3-4 câu 1 lần thôi,chứ hỏi như này thì,.....
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a) => 22 + 23 + x = 21 +24
=> 50 +x = 45
=> x = 45 - 50
=> x = -5
tíc mình nha
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1a) 25 .8 - 12.5 + 272 :17 - 8
= 200 - 60 + 16 - 8
= 140+16-8
= 156 - 8
= 148
b) 125: 25 +14 - 142 : 71
= 5 + 14 - 2
= 19 - 2 = 17
c) 13. 17 - 256: 16 + 14 : 7 - 1
= 221 - 16 + 2 - 1
= 205 + 2 - 1
= 207 - 1 = 206
d) 15 . 24 - 14 . 5 (145 : 5 - 27)
= 360 - 70 (29- 27)
= 360 - 70 . 2
= 360 - 140
= 220
2a) 37 + x = 55
x= 55 - 37
x = 18
b) x- 31 = 24
x = 24 + 31
x = 55
c) 21 (x-11) = 21
x - 11 = 21 : 21
x = 1 +11
x = 12
d ) 9. (x - 29)= 0
x - 29 = 0 :9
x = 29
e) (x - 1954) . 5 = 50
x - 1954 = 50 : 5
x = 1964
f ) 30 . 60 - x = 30
1800 - x = 30
x = 1800 - 30
x = 1770
Viết mỏi tay quá huhuh
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a) x=-2
b)x=7
c)x=11 hay -11
d)không có giá trị
e)x=85
f)x=-55
g)x=0
****
A) 15 - (X - 7) = 14 B) 14 + 3 : X = 15 C) 15 - 12 : X = 12 D) 7 + 2 (X + 1) = 27
X - 7 = 1 3 : X = 1 12 : X = 3 2 (X + 1) = 20
X = 8 X = 3 X = 4 X + 1 = 10
X = 9
E) X - 105 : 21 = 15 F) (X - 105) : 21 = 15 G) ( X - 5) (X - 7) = 0
X - 105 = 315 X - 105 = 315 TH1: X - 5 = 0
X = 420 X = 420 X = 5
TH2: X - 7 = 0
X = 7