Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(a,x+7=5-14\)
\(x+7=-9\)
\(x=-9-7\)
\(x=-16\)
\(b,-18-x=-8-13\)
\(-18-x=-21\)
\(x=-18+21\)
\(x=3\)
\(c,311-x+82=46+\left(x-21\right)\)
\(393-x=46+x-21\)
\(393-x=25+x\)
\(x+x=393-25\)
\(2x=368\)
\(x=184\)
\(d,\left|x-8\right|=7\)
\(\Rightarrow\orbr{\begin{cases}x-8=7\\x-8=-7\end{cases}\Rightarrow\orbr{\begin{cases}x=15\\x=1\end{cases}}}\)
\(f,12-x=25-\left(-7\right)\)
\(12-x=25+7\)
\(12-x=32\)
\(x=12-32\)
\(x=-20\)
\(g,-20+x=11-\left(-12\right)\)
\(-20+x=11+12\)
\(-20+x=23\)
\(x=23+20\)
\(x=43\)
\(h,-x-15=\left(-4\right)-\left(27-20\right)\)
\(-x-15=-11\)
\(x=-15+11\)
\(x=-4\)
\(i,15-\left(x-7\right)=-21\)
\(15-x+7=-21\)
\(22-x=-21\)
\(x=22+21\)
\(x=43\)
\(k,\left|x-3\right|+8=7\)
\(\left|x-3\right|=7-8\)
\(\left|x-3\right|=-1\)
\(TH1:x-3\ge0\Leftrightarrow x\ge3\)
\(\Rightarrow x-3=-1\)
\(\Rightarrow x=2\)( loại )
\(TH2:x-3< 0\Leftrightarrow x< 3\)
\(\Rightarrow-x+3=-1\)
\(\Rightarrow x=4\)( loại )
=> ko có giá trị nào cả
\(l,\left(x-2\right)\times\left(x+15\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-2=0\\x+15=0\end{cases}\Rightarrow\orbr{\begin{cases}x=2\\x=-15\end{cases}}}\)
\(m,-6x-\left(-7\right)=25\)
\(-6x+7=25\)
\(-6x=25-7\)
\(-6x=18\)
\(x=-3\)
a) \(x+5=20-\left(12-7\right)\)
\(\Rightarrow x+5=20-5\)
\(\Rightarrow x+5=15\)
\(\Rightarrow x=15-5\)
\(\Rightarrow x=10\)
b) \(15-\left(3+2x\right)=2^2\)
\(\Rightarrow3+2x=15-4\)
\(\Rightarrow3+2x=11\)
\(\Rightarrow2x=11-3\)
\(\Rightarrow2x=8\)
\(\Rightarrow x=\dfrac{8}{2}\)
\(\Rightarrow x=4\)
c) \(-11-\left(19-x\right)=50\)
\(\Rightarrow19-x=-11-50\)
\(\Rightarrow19-x=-61\)
\(\Rightarrow x=61+19\)
\(\Rightarrow x=80\)
d) \(159-\left(25-x\right)=43\)
\(\Rightarrow25-x=159-43\)
\(\Rightarrow25-x=116\)
\(\Rightarrow x=25-116\)
\(\Rightarrow x=-91\)
e) \(\left(79-x\right)-43=-\left(17-52\right)\)
\(\Rightarrow\left(79-x\right)-43=52-17\)
\(\Rightarrow79-x-43=35\)
\(\Rightarrow36-x=35\)
\(\Rightarrow x=1\)
f) \(\left(7+x\right)-\left(21-13\right)=32\)
\(\Rightarrow7+x-8=32\)
\(\Rightarrow x-1=32\)
\(\Rightarrow x=32+1\)
\(\Rightarrow x=33\)
g) \(-x+20=-15+8+13\)
\(\Rightarrow-x+20=6\)
\(\Rightarrow x=20-6\)
\(\Rightarrow x=14\)
h) \(-\left(-x+13-142\right)+18=55\)
\(\Rightarrow x-13+142+18=55\)
\(\Rightarrow x+147=55\)
\(\Rightarrow x=55-147\)
\(\Rightarrow x=-92\)
1) x - 2 = -6
x = -6 + 2
x = -4
2) -5 . x - ( -3 ) =13
-5 . x = 13 + ( -3 )
-5 . x = 10
x = 10 : ( -5 )
x = -2
a) 89-(73-x) = 20
=> 73+x =89-20
=> 73+x=69
=> x=69-73
=> x=-4
b) (x+7)-25=13
=> x+7=13+25
=> x+7=38
=> x=38-7
=> x=31
c) 98-(x+4)=20
=> x+4=98-20
=> x+4=78
=> x=78-4
=> x=73
d) 140:(x-8)=7
=> x-8=140:7
=> x-8=20
=> x=20+8
=> x=28
e) 4(x+41)=400
=> x+41=400:4
=> x+41=100
=> x=100-41
=> x=59
f) x-[42+(-28)]=-8
=> x-14=-8
=> x=-8+14
=> x=6
ai giúp e với ạ
Nếu Bạn Hỏi thì Hỏi từ từ 3-4 câu 1 lần thôi,chứ hỏi như này thì,.....