Ai giúp em với ạ
5.(3x+8)-7.(2x+3)=16
Giúp mình với (gấp với ai đúng đều cho 5 sao)
2x-16=40+x
16-2x=40-3x
2(4x-2x)-7x=16
-2(-3-4x)-3(3x+7)=31
9(x+4)-4(2x+15)=3
-2[x+(-7)]+(x-3)=12
(x-7)(x+2005)=0
2x-16=40+x=>x=56
16-2x=40-3x=>x=24
2(4x-2x)-7x=16=>x=-5,(3)
-2(-3-4x)-3(3x+7)=31=>x=-46
9(x+4)-4(2x+15)=3=>x=27
-2[x+(-7)]+(x-3)=12=>x=-1
(x-7)(x+2005)=0 =>x=7;-2005
giải hộ mik ạ
5/7+2/3x=3/10
\(\dfrac{5}{7}+\dfrac{2}{3}x=\dfrac{3}{10}\)
\(\Rightarrow\dfrac{2}{3}x=\dfrac{3}{10}-\dfrac{5}{7}\)
\(\Rightarrow\dfrac{2}{3}x=-\dfrac{29}{70}\)
\(\Rightarrow x=-\dfrac{29}{70}:\dfrac{2}{3}\)
\(\Rightarrow x=-\dfrac{87}{140}\)
5 . (3x + 8 ) -7 . (2x + 3) =16
các bạn giúp mình với nhé
5(3x + 8 ) - 7(2x + 3) = 16
5.3x + 5.8 - (7.2x + 7.3) = 16
15x + 40 - 7.2x - 7.3 = 16
15x + 40 - 14x - 21 = 16
(15x - 14x) + (40 - 21) = 16
15x - 14x + 19 = 16
15x - 14x = 16 - 19
x(15 - 14) = 16 - 19
x = 16 - 19
x = -3
-(x+2) . (2x+4) . (3x+6) . (4x+8)= (-24) . (-15)^16
giúp mình với
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
Tìm x thuộc Z
A. 5. ( 3x + 8)- 7. ( 2x + 3) = 16
Ai đúng mik sẽ tick nha
5(3x + 8) - 7(2x + 3) = 16
=> 15x + 40 - 14x - 21 = 16
=> x + 19 = 16
=> x = 16 - 19
=> x = -3
Vậy ...
A. 15x + 40 - 14x - 21 =16
x + 19 = 16
x = 16 - 19
x = -3 thuộc Z
Vậy x = -3.
Giúp mình với (rõ cách làm)(p.s không cần lảm hết đâu 1 câu cũng được)
2x-16=40+x
16-2x=40-3x
2(4x-2x)-7x=16
-2(-3-4x)-3(3x+7)=31
9(x+4)-4(2x+15)=3
-2[x+(-7)]+(x-3)=12
(x-7)(x+2005)=0
2x-16=40+x
2x-x=40+16
x=56
tick nhé cảm ơn
(x-7)(x+2005) = 0
\(\Rightarrow\) x-7 = 0
Vậy x = 7
Ai giúp vs !!!
\(a.\frac{3x-7}{5}=\frac{2x-1}{3}\\ b.\frac{4x-7}{12}-x=\frac{3x}{8}\\ c.\frac{x-2009}{1234}+\frac{x-2009}{5678}-\frac{x-2009}{197}=0\\ d.\frac{5x-8}{3}=\frac{1-3x}{2}\\ e.\frac{x-5}{6}-\frac{x-9}{4}=\frac{5x-3}{8}+2\\ f.\frac{x-1}{\frac{2}{5}}-3-\frac{3x-2}{\frac{5}{4}}-2=1\)
\(\frac{3x-7}{5}=\frac{2x-1}{3}\)
\(\Leftrightarrow9x-21=10x-5\)
\(\Leftrightarrow-x=16\Leftrightarrow x=-16\)
\(\frac{4x-7}{12}-x=\frac{3x}{8}\)
\(\Leftrightarrow\frac{4x-7-12x}{12}=\frac{3x}{8}\)
\(\Leftrightarrow\frac{-7-8x}{12}=\frac{3x}{8}\)
\(\Leftrightarrow-56-64x=36x\)
\(\Leftrightarrow-56=100x\Leftrightarrow x=\frac{-14}{25}\)
\(\frac{x-2009}{1234}+\frac{x-2009}{5678}-\frac{x-2009}{197}=0\)
\(\Leftrightarrow\left(x-2019\right)\left(\frac{1}{1234}+\frac{1}{5678}-\frac{1}{197}\right)=0\)
Vì \(\left(\frac{1}{1234}+\frac{1}{5678}-\frac{1}{197}\right)\ne0\)nên x - 2019 = 0
Vậy x = 2019
\(\frac{5x-8}{3}=\frac{1-3x}{2}\)
\(\Leftrightarrow10x-16=3-9x\)
\(\Leftrightarrow19x=19\Leftrightarrow x=1\)
\(\frac{x-5}{6}-\frac{x-9}{4}=\frac{5x-3}{8}+2\)
\(\Rightarrow\frac{4x-20-6x+54}{24}=\frac{5x-3+16}{8}\)
\(\Rightarrow\frac{-2x+34}{24}=\frac{5x+13}{8}\)
\(\Rightarrow-16x-272=120x+312\)
\(\Leftrightarrow-136x=584\Leftrightarrow x=\frac{-73}{17}\)
e) 5.(3x + 8) –7.(2x + 3) = 16
GIúp mk vs ạ :D
5.(3x+8)-7.(2x+3)=16
=> 15x+40-14x-21=16
=>(15x-14x)+(40-21)
=> x+19=16
=>x=-3. Vậy x=-3
k cho mik nha
Chúc bạn hok tốt
\(5\left(3x+8\right)-7\left(2x+3\right)=16\)
\(15x+40-14x-21=16\)
\(x+19=16\)
\(x+19-16=0\)
\(x+3=0\)
\(x=-3\)