[7x-19]-[5x-12]=3x-[9-2x]-1
(7x-19)-(5x-12)=3x-(9-2x)-1
cíu cíu tui zớiiiiiiiiii
Giải phương trình
1) 16-8x=0
2) 7x+14=0
3) 5-2x=0
4) 3x-5=7
5) 8-3x=6
6) 8=11x+6
7)-9+2x=0
8) 7x+2=0
9) 5x-6=6+2x
10) 10+2x=3x-7
11) 5x-3=16-8x
12)-7-5x=8+9x
13) 18-5x=7+3x
14) 9-7x=-4x+3
15) 11-11x=21-5x
16) 2(-7+3x)=5-(x+2)
17) 5(8+3x)+2(3x-8)=0
18) 3(2x-1)-3x+1=0
19)-4(x-3)=6x+(x-3)
20)-5-(x+3)=2-5x
20) -5-(x + 3) = 2 - 5x ⇔ -5 - x - 3 = 2 -5x ⇔ 4x = 10 ⇔ x = \(\frac{5}{2}\)
Vậy...
1) 16 - 8x = 0 ⇔ 8(2 - x) = 0⇔ 2 - x = 0 ⇔ x = 2
Vậy phương trình có nghiệm là x = 2
Giải phương trình
1) 16-8x=0
2) 7x+14=0
3) 5-2x=0
4) 3x-5=7
5) 8-3x=6
6) 8=11x+6
7)-9+2x=0
8) 7x+2=0
9) 5x-6=6+2x
10) 10+2x=3x-7
11) 5x-3=16-8x
12)-7-5x=8+9x
13) 18-5x=7+3x
14) 9-7x=-4x+3
15) 11-11x=21-5x
16) 2(-7+3x)=5-(x+2)
17) 5(8+3x)+2(3x-8)=0
18) 3(2x-1)-3x+1=0
19)-4(x-3)=6x+(x-3)
20)-5-(x+3)=2-5x
Mấy cái này chuyển vế đổi dấu là xong í mà :3
1,
16-8x=0
=>16=8x
=>x=16/8=2
2,
7x+14=0
=>7x=-14
=>x=-2
3,
5-2x=0
=>5=2x
=>x=5/2
Mk làm 3 cau làm mẫu thôi
Lúc đăng đừng đăng như v :>
chi ra khỏi ngt nản
từ câu 1 đến câu 8 cs thể làm rất dễ,bn tham khảo bài của bn muwaa r làm những câu cn lại
1, 16 - 8x = 0
<=>-8x = 16
<=> x = -2
Vậy_
2, 7x + 14 = 0
<=> 7x = -14
<=> x = -2
3, 5 - 2x = 0
<=> - 2x = -5
<=> x =\(\frac{5}{2}\)
Vậy_
4, 3x - 5 = 7
<=> 3x = 7 + 5
<=> 3x = 12
<=> x = 4
Vậy...
5, 8 - 3x = 6
<=> - 3x = 6 - 8
<=> -3x = - 2
<=> x =\(\frac{2}{3}\)
Vậy......
Tìm x, biết :
a, 2x - (-3x - 17) = 53 - 26 - x
b,5x - (-24) =33-78+4x
c,(7x - 19) - (5x -12) = 3x - (9-2x) -1
d,(2x +5)2 = -125
e,(4x - 3)2 = 289
f,-2*(12-5x)3 = -686
g,2mũ x+5 -3*2mũ x = 928
h,3mũ x +3 mũ x+1 + 3mũ x+2 = 13
A=3X^2+7X-76
B=1/2x^2-19/6x+1
C=2x^2+5x+3
7+2x=22-3x
x-12+4x=25+2x-1
7-(2x+4)=-(x+4)
8x-3=5x+12
x+2x+3x-19=3x+5
(x-1)-(2x-1)=9-x
Gọi a,b,c,... cho dễ nhé!
a,\(7+2x=22-3x\)
\(\Leftrightarrow2x+3x=22-7\)
\(\Leftrightarrow5x=15\)
\(\Leftrightarrow x=3\)
Vậy...
b,\(x-12+4x=25+2x-1\)
\(\Leftrightarrow x+4x-2x=25-1+12\)
\(\Leftrightarrow3x=36\)
\(\Leftrightarrow x=12\)
Vậy...
c,\(7-\left(2x+4\right)=-\left(x+4\right)\)
\(\Leftrightarrow7-2x-4=-x-4\)
\(\Leftrightarrow-2x+x=-4+4-7\)
\(\Leftrightarrow-x=-7\)
\(\Leftrightarrow x=7\)
Vậy...
d,\(8x-3=5x+12\)
\(\Leftrightarrow8x-5x=12+3\)
\(\Leftrightarrow3x=15\)
\(\Leftrightarrow x=5\)
Vậy...
e,\(x+2x+3x-19=3x+5\)
\(\Leftrightarrow x+2x+3x-3x=5+19\)
\(\Leftrightarrow3x=24\)
\(\Leftrightarrow x=8\)
Vậy...
f,\(\left(x-1\right)-\left(2x-1\right)=9-x\)
\(\Leftrightarrow x-1-2x+1=9-x\)
\(\Leftrightarrow x-2x+x=9-1+1\)
\(\Leftrightarrow0x=9\) (Vô lý)
Vậy...
a, \(7+2x=22-3x\)
\(\Rightarrow7+2x-22+3x=0\)
\(\Rightarrow5x-15=0\)
\(\Rightarrow5x=15\Rightarrow x=3\)
b, \(x-12+4x=25+2x-1\)
\(\Rightarrow3x-12-24-2x=0\)
\(\Rightarrow x-36=0\Rightarrow x=36\)
c, \(7-\left(2x+4\right)=-\left(x+4\right)\)
\(\Rightarrow7-2x-4=-x-4\)
\(\Rightarrow3-2x+x+4=0\)
\(\Rightarrow-x=-7\Rightarrow x=7\)
d, \(8x-3=5x+12\)
\(\Rightarrow8x-3-5x-12=0\)
\(\Rightarrow3x-15=0\)
\(\Rightarrow3x=15\Rightarrow x=5\)
e, \(x+2x+3x-19=3x+5\)
\(\Rightarrow6x-19-3x-5=0\)
\(\Rightarrow3x-24=0\)
\(\Rightarrow3x=24\Rightarrow x=8\)
f, \(\left(x-1\right)-\left(2x-1\right)=9-x\)
\(\Rightarrow x-1-2x+1-9+x=0\)
(hình như câu này bị sai đề rồi, bạn xem lại đề nhé)
Chúc bạn học tốt!
5x + 2x =62 - 50
5x + x = 150 : 2+ 3
6x + x = 511 : 59 - 31
5x + 3x = 36 ; 33 .4 +12
4x + 2x = 68 - 219 : 2 16
5x + x = 39 - 311 : 39
7x - x = 521 : 519 + 3. 22 - 70
7x - 2x = 617 : 615 + 44 : 11
\(5x+2x=6^2-5^0\)
\(7x=36-1\)
\(7x=35\)
\(x=5\)
vậy \(x=5\)
\(5x+x=150:2+3\)
\(6x=75+3\)
\(x=78:6\)
\(x=13\)
vậy \(x=13\)
những câu sau tương tự
1) 5x + 2x = 6^2 - 5^0
=> 7x = 36 - 1 = 35
=> x = 35 : 5 = 5.
Vậy x = 5
2) 5x + x = 150 : 2 + 3
=> 6x = 75+3 = 78
=> x = 78 : 6 =13.
Vậy x = 13
3) 6x + x = 5^11 : 5^9 - 3^1
=> 7x = 5^2 -3 = 25 - 3 = 22
=> x = 22 : 7 = 22 / 7.
Vậy x = 22/7
4) 5x + 3x = 3^6 : 3^3 .4 + 12
=> 8x = 3^3 .4 + 12= 27.4 + 12 = 108 + 12 =120
=> x = 120 : 8 = 15.
Vậy x = 15
5) 4x + 2x = 68 - 2^19 : 2^16
=> 6x = 68 - 2 ^3 = 68 - 8 =60
=> x = 60 : 6 =10.
Vậy x = 10
6) 5x + x = 39 - 3^11 : 3^9
=> 6x = 39 - 3^2 = 39 - 9 = 30
=> x = 30 : 6 =5.
Vậy x =5
7) 7x - x = 5^21 : 5^19 + 3. 2^2 - 7^0
=> 6x = 5^2 + 3.4 - 1 = 25 + 12 - 1 = 36
=> x = 36 : 6 = 6.
Vậy x = 6
8) 7x - 2x = 6^17 : 6^15 + 44 : 11
=> 5x = 6^2 + 4 = 36 + 4 = 40
=> x = 40 : 5 = 8 .
Vậy x = 8
7x-x=521:519+3.22-70
=> 6x = 5^2 + 12 -1
=> 6x = 36
=> x = 36/6 = 6
Kết quả 6
Học tốt
Bài 1 a) 7x+2x=22-3x
b) 8x-3=5x+12
c) x-12+4x=25+2x-1
d) x+2x+3x-19=3x+5
Bài 2:
a) (2,3x-6,9) (0,1x+2)=0
b) (2x+7) (x-5) (5x+1)=0
c) (4x+2) (x2+1)=0
d) ( x2-4)+(x-2) (3-2x)=0
`Answer:`
Bài 1:
a) \(7+2x=22-3x\)
\(\Leftrightarrow2x+3x=22-7\)
\(\Leftrightarrow5x=15\)
\(\Leftrightarrow x=3\)
b) \(8x-3=5x+12\)
\(\Leftrightarrow8x-5x=12+3\)
\(\Leftrightarrow3x=15\)
\(\Leftrightarrow x=5\)
c) \(x-12+4x=25+2x-1\)
\(\Leftrightarrow x-12+4x-25-2x+1=0\)
\(\Leftrightarrow\left(x+4x-2x\right)+\left(1-12-25\right)=0\)
\(\Leftrightarrow3x-36=0\)
\(\Leftrightarrow x=12\)
d) \(x+2x+3x-19=3x+5\)
\(\Leftrightarrow6x-19=3x+5\)
\(\Leftrightarrow6x-3x=5+19\)
\(\Leftrightarrow3x=24\)
\(\Leftrightarrow x=8\)
Bài 2:
a) \(\left(2,3x-6,9\right)\left(0,1x+2\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}2,3x-6,9=0\\0,1x+2=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=3\\x=-20\end{cases}}}\)
b) \(\left(2x+7\right)\left(x-5\right)\left(5x+1\right)=0\)
\(\Leftrightarrow2x+7=0\text{ hoặc }x-5=0\text{ hoặc }5x+1=0\)
\(\Leftrightarrow x=-\frac{7}{2}\text{ hoặc }x=5\text{ hoặc }x=-\frac{1}{5}\)
c) \(\left(4x+2\right)\left(x^2+1\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}4x+2=0\\x^2+1=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=-\frac{1}{2}\\x^2=-1\text{(Loại)}\end{cases}}}\)
d) \(\left(x^2-4\right)+\left(x-2\right)\left(3-2x\right)=0\)
\(\Leftrightarrow x^2-4+\left(3x-2x^2-6+4x\right)=0\)
\(\Leftrightarrow x^2-4=\left(-2x^2+7x-6\right)=0\)
\(\Leftrightarrow x^2-4-2x^2+7x-6=0\)
\(\Leftrightarrow-x^2+7x-10=0\)
\(\Leftrightarrow x^2-5x-2x+10=0\)
\(\Leftrightarrow x.\left(x-5\right)-2.\left(x-5\right)=0\)
\(\Leftrightarrow\left(x-5\right).\left(x-2\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x-5=0\\x-2=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=5\\x=2\end{cases}}}\)
a)15-8x=9-5x
b)2x+x+12=0
c)5-3x=6x+7
d)10+4x=2x-3
e)3x+1=7x-11
d)11-2x=x-1
15-8x=9-5x
<=> 5x - 8x = 9 - 15
<=> -3x = -6
<=> x = 2