1)(2x+1)-7=14
2)15-(3x-1)+11=59
3)70-5(x-3)=45
4)412-15.(nhân)(27-x)=97
5)2008(2x+7)=112
6)126-17(3x-5)=7
7)(2600+6400)-3x=1200
8)123-5(x+4)=38
GIÚP MIK GIẢI NHÉ !!! @.@
bài tìm x này tới 20 câu lận nhé và mik cần cách trình bày lun nhé chứ k pải đáp số không. Mong các bn giúp mik
1) 21+(x+23)=50
2)125+(x-100)=150
3)24+(10-x)=26
4)148+(78+x)=244
5)(x+97)-140=12
6)(x+97)-100=12
7)56-(x+14)=22
8)491-(x-83)=72
9)(x-17)-143=0
10)241+(107-x)
11)172-(x+18)=93
12)(x+72)-184=56
13)(2x+1)-7=14
14)15-(3x-1)+11=59
15)70-5(x-3)=45
16)412-15.(nhân)(27-x)=97
17)2008(2x+7)=112
18)126-17(3x-5)=7
19)(2600+6400)-3x=1200
20)123-5(x+4)=38
Cau 1)
21+(x+23)=50
X+23=50-21
X=29-23
X=6
Cau 2)
125+(x-100)=150
X-100=150-125
X=25+100
X=125
Cau 3)
24+(10-x)=26
10-x=26-24
X=10-2
X=8
1. 3y = 0
2. 1+x=0
3. 1-2t=0
4. 2x+x+3=0
5. 25x-20=0
6. 51x=17
7. 2x-3=x+5
8. x-8=2x+3
9. 17-2x=3x-5
10. 2x+x+22=0
11. x-3=3x+5
12.15x+1/2=0
13. 3x+1=7x-11
14. 5-3x=6x+7
15. 11-2x=x-1
16. 15-8x=9-5x
17. 25-3x=4x-5
18. 0,25x+1,5=0
19. 3x-5/6=1/2
20. -2x+14=0
giúp mik nha chìu nay mik cần gấp
thanks
1. 3y = 0
=> y = 0
2. 1+x = 0
<+ x = -1
3.
\(1-2t=0\)
\(\Leftrightarrow2t=1\)
\(\Leftrightarrow\dfrac{1}{2}\)
4. 2x +x + 3 =0
\(\Leftrightarrow3x+3=0\)
\(\Leftrightarrow x=-3\)
5.
\(25x-20=0\)
\(\Leftrightarrow25x=20\)
\(\Leftrightarrow x=\dfrac{4}{5}\)
7.
2x-3 = x+5
<=> 2x - x = 5+3
<=> x = 8
8.
x-8=2x+3
<=> x - 2x = 3+8
<=> -x = 11
<=> x = -11
9. 17-2x = 3x-5
<=> -2x-3x = -5-17
<=> -5x = -22
<=> x = \(\dfrac{22}{5}\)
10.
2x+x+22=0
<=> 3x+22=0
<=> 3x = -22
<=> x = \(\dfrac{-22}{3}\)
Mấy bài kia tự giải tương tự nhá!!!
11.
x-3=3x+5
<=> x-3x=5+3
<=> -2x=8
<=> x = -4
12. 15x + 1/2 = 0
<=> 15x = -1/2
<=> x = -1/30
13.
3x+1 = 7x-11
<=> 3x-7x = -11-1
<=> -4x=-12
<=> x = 3
14.
5-3x = 6x + 7
<=> -3x-6x = 7-12
<=> -9x = -5
<=> x = 5/9
15.
11-2x=x-1
<=> -2x-x = -1-11
<=> -3x = -12
<=> x = 4
16.
15 - 8x = 9-5x
<=> -8x+5x = 9 - 15
<=> -3x = -6
<=> x=2
17.
25-3x=4x-5
<=> -3x-4x = -5-25
<=> -7x = -30
<=> x = 30/7
18.
0,25x+1,5=0
<=> 0,25x = -1,5
<=> x = -6
19.
3x-5/6 = 1/2
<=> 3x - 5/6 = 3/6
<=> 3x-5=3
<=> 3x = 8
<=> x = 8/3
20.
-2x + 14 =0
<=> -2x = -14
<=> x = 7
Tim X
3) -12 + (2x – 9) + x= 0
4) 11 + (15 - x) = 1
5) 4 - (27 - 3) = x - (13 - 4)
6) 8 - (x - 10) = 23 - (- 4 +12)
7) 105 – 5(10 – 5x) = -20
8) (x -1)(8-2x)(3x+123) = 0
9) (x2 - 25)(x+ 10) = 0
10) x(x2+5) =
3) \(-12+2x-9+x=0\\ -21+3x=0\\ 3x=21\\ x=7\)
4)
\(11+\left(15-x\right)=1\)
\(15-x=1-11\)
\(15-x=-10\)
\(x=15-\left(-10\right)\)
\(x=25\)
5)
\(4-\left(27-3\right)=x-\left(13-4\right)\)
\(4-24=x-9\)
\(x-9=-20\)
\(x=-20+9\)
\(x=-11\)
\(3.-12+\left(2x-9\right)+x=0.\)
\(\Leftrightarrow-12+2x-9+x=0.\Leftrightarrow3x=21.\Leftrightarrow x=7.\)
Vậy \(x=7.\)
\(4.11+\left(15-x\right)=1.\Leftrightarrow11+15-x=1.\Leftrightarrow26-x=1.\Leftrightarrow x=25.\)
Vậy \(x=25.\)
\(5.4-\left(27-3\right)=x-\left(13-4\right).\Leftrightarrow4-24=x-9.\Leftrightarrow-20=x-9.\Leftrightarrow x=-11.\)
Vậy \(x=-11.\)
\(6.8-\left(x-10\right)=23-\left(-4+12\right).\Leftrightarrow8-x+10=23-8.\Leftrightarrow18-x=15.\Leftrightarrow x=3.\)
Vậy \(x=3.\)
\(7.105-5\left(10-5x\right)=-20.\Leftrightarrow105-50+25x=-20.\Leftrightarrow25x=-75.\Leftrightarrow x=-3.\)
Vậy \(x=-3.\)
\(8.\left(x-1\right)\left(8-2x\right)\left(3x+123\right)=0.\)
\(\Leftrightarrow\left[{}\begin{matrix}x-1=0.\\8-2x=0.\\3x+123=0.\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=1.\\x=4.\\x=-41.\end{matrix}\right.\)
Vậy \(x\in\left\{1;4;-41\right\}.\)
\(9.\left(x^2-25\right)\left(x+10\right)=0.\)
\(\Leftrightarrow\left(x-5\right)\left(x+5\right)\left(x+10\right)=0.\)
\(\Leftrightarrow\left[{}\begin{matrix}x-5=0.\\x+5=0.\\x+10=0.\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=5.\\x=-5.\\x=-10.\end{matrix}\right.\)
Vậy \(x\in\left\{5;-5;-10\right\}.\)
\(10.x\left(x^2+5\right)=0.\Leftrightarrow x=0.\)
Bài 1: Tìm x [GIÚPPPPPPPPPPPPPPPPPPP]
1) 5 – (10 – x) = 7
2) - 32 - (x – 5) = 0
3) -12 + (2x – 9) + x= 0
4) 11 + (15 - x) = 1
5) 4 - (27 - 3) = x - (13 - 4)
6) 8 - (x - 10) = 23 - (- 4 +12)
7) 105 – 5(10 – 5x) = -20
8) (x -1)(8-2x)(3x+123) = 0
9) (x2 - 25)(x+ 10) = 0
10) x(x2+5) = 0
\(1\)) \(5-\left(10-x\right)=7\)
\(10-x=5-7\)
\(10-x=-2\)
\(x=10-\left(-2\right)\)
\(x=12\)
\(2\)) \(-32-\left(x-5\right)=0\)
\(x-5=-32-0\)
\(x-5=-32\)
\(x=-32+5\)
\(x=-27\)
1)10-x=5-7
x=10-(-2)
x=12
2)x+5=0+32
x=32-5
x=27
3) -12+2x-9+x=0
-12+(2x+x-9)=0
3x-9=0+12
3x=12+9
x=21:3
x=7
4) 15-x=1-11
x=15-(-10)
x=25
5) 4-(27+3)=x-9
4-30=x-9
-26+9=x
x=-17
1.Tìm x , biết
a.1/2x + 5/2=7/2x - 3/4
b.2/3x-2/5=1/2x-1/3
c.1/3x + 2/5 ( x+1) = 0
d.2/3-1/3(x-3/2) -1/2 (2x+1) = 5
e. 11/15 -( 7/9 +x ) * 3/8=61/90+x/3
j.5x(2x-1/2)+2(2x-1/2)= 0
Các bạn giải giúp mình nhé .Giải chi tiết nhé . Mik đang cần gấp . Cảm ơn
\(a,\frac{1}{2}x+\frac{5}{2}=\frac{7}{2}x-\frac{3}{4}\)
\(\Leftrightarrow\frac{1}{2}x+\frac{5}{2}-\frac{7}{2}x=-\frac{3}{4}\)
\(\Leftrightarrow\frac{1}{2}x-\frac{7}{2}x+\frac{5}{2}=-\frac{3}{4}\)
\(\Leftrightarrow-3x+\frac{5}{2}=-\frac{3}{4}\)
\(\Leftrightarrow-3x=-\frac{13}{4}\)
\(\Leftrightarrow x=-\frac{13}{4}:(-3)=-\frac{13}{4}:\frac{-3}{1}=-\frac{13}{4}\cdot\frac{-1}{3}=\frac{13}{12}\)
\(b,\frac{2}{3}x-\frac{2}{5}=\frac{1}{2}x-\frac{1}{3}\)
\(\Leftrightarrow\frac{2}{3}x-\frac{2}{5}-\frac{1}{2}x=-\frac{1}{3}\)
\(\Leftrightarrow\frac{2}{3}x-\frac{1}{2}x-\frac{2}{5}=-\frac{1}{3}\)
\(\Leftrightarrow\frac{1}{6}x-\frac{2}{5}=-\frac{1}{3}\)
\(\Leftrightarrow\frac{1}{6}x=\frac{1}{15}\)
\(\Leftrightarrow x=\frac{1}{15}:\frac{1}{6}=\frac{1}{15}\cdot6=\frac{6}{15}=\frac{2}{5}\)
\(c,\frac{1}{3}x+\frac{2}{5}(x+1)=0\)
\(\Leftrightarrow\frac{1}{3}x+\frac{2}{5}x+\frac{2}{5}=0\)
\(\Leftrightarrow\frac{11}{15}x=-\frac{2}{5}\)
\(\Leftrightarrow x=-\frac{6}{11}\)
d,e,f Tương tự
Tìm x,y,z biết: x-3/0,2=2x-1/-0,5 3x-1/2x+3=3x+2/2x-1
4x-1/4x+5=-x-2/-x+7
x/y=5/7 và 2x-y=15
x/3=y/5=7/7 và x +y-27=36
mik đag cần liền, giải hộ mik với
đề ở câu đầu:
x-3/0,2=2x-1/-0,5
3x-1/2x+3=3x+2/2x-1
a: =>-0,5x+1,5=0,4x-0,2
=>-0,9x=-1,7
=>x=17/9
3x-1/2x+3=3x+2/2x-1
=>6x^2-3x-2x+1=6x^2+4x+9x+6
=>-5x+1=13x+6
=>-8x=5
=>x=-5/8
b: \(\Leftrightarrow\left(4x-1\right)\left(-x+7\right)=\left(4x+5\right)\left(-x-2\right)\)
=>\(-4x^2+28x+x-7=-4x^2-8x-5x-10\)
=>29x-7=-13x-10
=>42x=-3
=>x=-1/14
c: =>7x=5y và 2x-y=15
=>7x-5y=0 và 2x-y=15
=>x=25; y=35
1. Thực hiện phép tính.
a) ( 2x - 5 ) ( 4 - 3x ) - ( 3x +11 ) ( 5 - 2x ) - 15 ( 2x - 5 ).
b) ( x2 - 2x + 3 ) ( 3x - 5 ) - ( x2 + x -1 ) ( 2x + 7 )
Các bn lm cụ thể ra cho mik nhé ! Đừng lm tắt ...
a) = 8x-6x-20+15x-15-6x+55-22x-30x+75
b)3x3+5x2-6x2+10x+9x-15-2x3+7x2+2x2+7x-2x-7
bạn chỉ cần chép lại đầu bài rồi ghi kết quả này vào là xong nhá bởi vì đây là nhân đa thức với đa thức mà
a) (2x-5)(4-3x)-(3x+11)(5-2x)-15(2x-5)
=(2x-5)(4-3x)+(3x+11)(2x-5)-15(2x-5)
=(2x-5)[(4-3x)+(3x+11)-15]
=(2x-5)(4-3x+3x+11-15)
= 2x-5
tìm số nguyên x biết:
a,-5.(-x+7)-3.(-x-5)=-4.(12-x)+48
b;-2.(15-3x)-4.(7x+8)=-5-9.(-2x+1)
c,7.(-x-7)-5.(-x-3)=12.(3-x)
d,5.(-3x-7)-4.(-2x-11)=7.(4x+10)+9
GIÚP MIK VS NHÉ AI LÀM ĐC HẾT MÀ ĐÚNG MIK SẼ CHO 1 TICK
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