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\(a,2.\left(x-5\right)-3.\left(x+7\right)=14\)
\(2x-10-3x-21=14\)
\(-x-31=14\)
\(x=-31-14\)
\(x=-45\)
\(b,5.\left(x-6\right)-2\left(x+3\right)=12\)
\(5x-30-2x-6=12\)
\(3x-36=12\)
\(3x=12+36\)
\(3x=48\)
\(x=16\)
\(c,-5.\left(2-x\right)+4.\left(x-3\right)=10.x-15\)
\(-10+5x+4x-12=10x-15\)
\(-6x-22=10x-15\)
\(-6x-10x=-15+22\)
\(-16x=7\)
\(x=-\frac{7}{16}\)
Câu d , e f tương tự nha
a) 4(x+1)-(3x+1)=14
<=>4x+4-3x-1=14
<=>4x-3x = 14-4
<=>x=10
b) -12(x-5) +7.(3x)=5
<=> -12x +60 + 21+7x=5
<=> -12x+7x=5-60-21
<=> -5x=-76
<=> x=76/5
c) 17x + 34 -4x+28-9x=82
<=> 17x-9x-4x=82-34-28
<=> 4x=20
<=> x=5
\(a)\frac{-84}{14}< 3x< \frac{108}{9}\)
\(\Rightarrow-6< 3x< 12\)
\(\Rightarrow-2< x< 4\)
\(\Rightarrow x=3\)
\(c)\frac{x-1}{9}=\frac{8}{3}\)
\(\Rightarrow x-1=\frac{8}{3}\cdot9\)
\(\Rightarrow x-1=24\)
\(\Rightarrow x=25\)
\(d)\frac{-x}{4}=\frac{-9}{x}\)
\(\Rightarrow(-x)\cdot x=(-9)\cdot4\)
\(\Rightarrow-x^2=-36\)
\(\Rightarrow x=\pm6\)
\(e)\frac{x}{4}=\frac{18}{x+1}\)
\(\Rightarrow x(x+1)=18\cdot4\)
\(\Rightarrow x(x+1)=72\)
\(\Rightarrow x(x+1)=8\cdot9=(-9)\cdot(-8)\)
Do đó : x = 8 hoặc x = -9
\(\left(x+2\right)-2=0\)
\(\Rightarrow x+2-2=0\)
\(\Rightarrow x=0\)
\(\left(x+3\right)+1=7\)
\(\Rightarrow x+3+1=7\)
\(\Rightarrow x+4=7\)
\(\Rightarrow x=3\)
\(\left(3x-4\right)+4=12\)
\(\Rightarrow3x-4+4=12\)
\(\Rightarrow3x=12\)
\(\Rightarrow x=4\)
\(\left(5x+4\right)-1=13\)
\(\Rightarrow5x+4-1=13\)
\(\Rightarrow5x+3=13\)
\(\Rightarrow5x=10\)
\(\Rightarrow x=2\)
\(\left(4x-8\right)-3=5\)
\(\Rightarrow4x-8-3=5\)
\(\Rightarrow4x-11=5\)
\(\Rightarrow4x=16\)
\(\Rightarrow x=4\)
\(8-\left(2x+4\right)=2\)
\(\Rightarrow8-2x-4=2\)
\(\Rightarrow4-2x=2\)
\(\Rightarrow2x=2\)
\(\Rightarrow x=1\)
\(7+\left(5x+2\right)=14\)
\(\Rightarrow7+5x+2=14\)
\(\Rightarrow9+5x=14\)
\(\Rightarrow5x=5\)
\(\Rightarrow x=1\)
\(5-\left(3x-11\right)=1\)
\(\Rightarrow5-3x+11=1\)
\(\Rightarrow16-3x=1\)
\(\Rightarrow3x=15\)
\(\Rightarrow x=5\)
nhiều quá :((
\(a,2\left(x-5\right)-3\left(x+7\right)=14\)
\(2x-10-3x-21=14\)
\(-x-31=14\)
\(-x=45\)
\(x=45\)
\(b,5\left(x-6\right)-2\left(x+3\right)=12\)
\(5x-30-2x-6=12\)
\(3x-36==12\)
\(3x=48\)
\(x=16\)
\(c,3\left(x-4\right)-\left(8-x\right)=12\)
\(3x-12-8+x=0\)
\(4x-20=0\)
\(4x=20\)
\(x=5\)
Cố nốt nha bn !
cảm ơn, bn nha:)))
mà hình như bạn TOP 3 trả lời câu hỏi pải ko nhỉ???
a)-2-13-14-19=-48
b)221+4[-40-4]=221-176=45
c)(-2)^5+32=-32+32=0
d)=93
Bài 2:Tim x, biết
a)-3x=-7-8<=>x=5
b)(x-6).(7-x)=0
=>_x-6=0=>x=6
_7-x=0=>x=7
Bài 1 .Tính
a, (-2)-13+(-14)-19
= -15+(-14)-19
= -29-19
= -48
b,221+4[(-5).8-4]
=221+4[-40-4]
=221+4(-44)
=221+(-176)
=-45
c,(-2)3.(-2)2+32
=-8.4+32
=-32+32
=0
d,-15.12-8.(-12)
=-15.12-(-8).12
=12.[-15-(-8)]
=12.(-7)
=-84
Bài 2 .Tìm x , biết
a, -3x+8=-7
-3x=-7-8
-3x=-15
x=-15:(-3)
x=5
Vậy x=5
b, (x-6).(7-x)=0
\(\Rightarrow\orbr{\begin{cases}x-6=0\\7-x=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=0+6=6\\x=7-0=7\end{cases}}\)
Vậy..............................
a) x - 14 = 3x + 18
=> x - 3x = 18 + 14
=> -2x = 32
=> x = 32 : (-2)
=> x = -16
b) 2(x - 5) - 3(x - 4) = -6 + 15.(-3)
=> 2x - 10 - 3x + 12 = -6 - 45
=> -x + 2 = -51
=> -x = -51 - 2
=> -x = -53
=> x = 53
c) (x + 7)(x - 9) = 0
=> \(\orbr{\begin{cases}x+7=0\\x-9=0\end{cases}}\)
=> \(\orbr{\begin{cases}x=-7\\x=9\end{cases}}\)
Vậy ...
d) |2x - 5| - 7 = 22
=> |2x - 5| = 22 + 7
=> |2x - 5| = 29
=> \(\orbr{\begin{cases}2x-5=29\\2x-5=-29\end{cases}}\)
=> \(\orbr{\begin{cases}2x=34\\2x=-24\end{cases}}\)
=> \(\orbr{\begin{cases}x=17\\x=-12\end{cases}}\)
Vậy ...
- a\(x-14=3x+18\Rightarrow3x-x=-14-18=-32\Rightarrow x=-16\)
- b, \(2\left(x-5\right)-3\left(x-4\right)=-6+15.\left(-3\right)\Rightarrow2x-10-3x+12=-6-45\)
- \(\Rightarrow-x+2=-51\Rightarrow-x=-53\Rightarrow x=53\)
- c.\(\left(x+7\right).\left(x-9\right)=0\Rightarrow\orbr{\begin{cases}x+7=0\\x-9=0\end{cases}\Rightarrow\orbr{\begin{cases}x=-7\\x=9\end{cases}}}\)
- d.Bạn tự làm nhé
d) \(\left|2x-5\right|-7=22\)
\(\Rightarrow\left|2x-5\right|=22+7\)
\(\Rightarrow\left|2x-5\right|=29\)
\(\Rightarrow\orbr{\begin{cases}2x-5=29\\2x-5=-29\end{cases}}\) \(\Rightarrow\orbr{\begin{cases}2x=34\\2x=-24\end{cases}}\) \(\Rightarrow\orbr{\begin{cases}x=17\\x=-12\end{cases}}\)
Vậy x = 17 hoặc x = -12
a) x + 4 = – 14 – 9
x + 4 = – 23
x = – 23 – 4
x = – 27
b) 3x = – 14 + 2
3x = – 12
x = – 12 : 3
x = – 4
c) 2| x | = 4 – (– 8)
2| x | = 12
| x | = 6
x = 6 hoặc x = – 6
d) |x – 2| = 7
x – 2 = 7 hoặc x – 2 = – 7
x = 9 hoặc x = – 5