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a) \(3x-18.28:14=308\)
\(=>3x-36=308\)
\(=>3x=344\)\(\)
\(=>x=\frac{344}{3}\)
\(\)b)\(38+\left|x\right|=\left(-12\right)+65\)
\(=>38+\left|x\right|=53=>\left|x\right|=15=>\orbr{\begin{cases}x=15\\x=-15\end{cases}}\)
c)\(15+3.\left(x-1\right):5=30\)
\(=>15+3.\left(x-1\right)=150\)
\(=>3.\left(x-1\right)=135\)
\(x-1=45=>x=46\)
d) \(5.\left(7-3x\right)+7.\left(2+2x\right)=1\)
\(=>35-15x+14+14x=1\)
\(=>49-x=1=>x=48\)
e)\(3.\left(x-7\right)=21\)
\(=>x-7=7=>x=14\)
g)\(\left[\left(6x-72\right):2-84\right]:28=5628\)
\(\left(6x-72\right):2-84=157584\)
\(\left(6x-72\right):2=157668\)
\(6x-72=315336\)
\(6x=315408=>x=52568\)
h)\(123-5\left(x+4\right)=28\)
\(5.\left(x+4\right)=95\)
\(x+4=19=>x=15\)
p)\(14.\left(x-3\right)-138=73\)
\(14.\left(x-3\right)=211\)
\(x-3=\frac{211}{14}=>x=\frac{253}{14}\)
\(t\)
\(\left|x\right|-5=2\)
\(\left|x\right|=7=>\orbr{\begin{cases}x=7\\x=-7\end{cases}}\)
v)\(4x-72=\left|100-8.25\right|\)
\(4x-72=\left|-100\right|\)
\(4x-72=100=>4x=172=>x=43\)
cậu có thể tham khảo bài làm trên đây ạ, chúc cậu học tốt ^^
18x -19 = 21 + 8x
18 x - 8x = 21 + 19
10 x = 40
x =4
g) 18 -4x=-20-6x
-4x + 6x = -20 - 18
2x = -38
x= -19
k, -10 \(x\) - 27 = -7\(x\) + 33
-27 - 33 = -7\(x\) + 10\(x\)
3\(x\) = -60
\(x\) - 20
m, -17\(x\) - 24 = -9\(x\) - 40
-24 + 40 = -9\(x\) + 17\(x\)
8\(x\) = 16
\(x\) = 2
18 - 4\(x\) = -20 - 6\(x\)
-4\(x\) + 6\(x\) = - 20 - 18
2\(x\) = - 38
\(x\) = - 19
h, -15 \(\times\) 24 = -7\(x\) + 32
7\(x\) = 360 + 32
7\(x\) = 392
\(x\) = 392:7
\(x\) = 56
i, 15\(x\) -3.(4\(x\) - 6) = -12 + 36
15\(x\) - 12\(x\) + 18 = 24
3\(x\) = 24 - 18
3\(x\) = 6
\(x\) = 2
k, -10\(x\) - 27 = -7\(x\) + 33
-27 - 33 = -7\(x\) + 10\(x\)
3\(x\) = -60
\(x\) = -20
Dễ thế mà không làm được thì bạn nên xem lại nhé,một hai câu thì còn được chứ cả 10 câu thế kia rõ là ỷ lại rồi bạn ạ.Thân!
a) \(\dfrac{2}{3}x-\dfrac{1}{2}=\dfrac{1}{10}\)
\(\dfrac{2}{3}x=\dfrac{1}{10}+\dfrac{1}{2}=\dfrac{3}{5}\)
\(x=\dfrac{3}{5}:\dfrac{2}{3}=\dfrac{9}{10}\)
b) \(\dfrac{39}{7}:x=13\)
\(x=\dfrac{\dfrac{39}{7}}{13}=\dfrac{3}{7}\)
c) \(\left(\dfrac{14}{5}x-50\right):\dfrac{2}{3}=51\)
\(\dfrac{14}{5}x-50=51\cdot\dfrac{2}{3}=34\)
\(\dfrac{14}{5}x=34+50=84\)
\(x=\dfrac{84}{\dfrac{14}{5}}=30\)
d) \(\left(x+\dfrac{1}{2}\right)\left(\dfrac{2}{3}-2x\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x+\dfrac{1}{2}=0\\\dfrac{2}{3}-2x=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=-\dfrac{1}{2}\\x=\dfrac{1}{3}\end{matrix}\right.\)
e) \(\dfrac{2}{3}x-\dfrac{1}{2}x=\dfrac{5}{12}\)
\(\dfrac{1}{6}x=\dfrac{5}{12}\)
\(x=\dfrac{5}{12}:\dfrac{1}{6}=\dfrac{5}{2}\)
g) \(\left(x\cdot\dfrac{44}{7}+\dfrac{3}{7}\right)\dfrac{11}{5}-\dfrac{3}{7}=-2\)
\(\left(x\cdot\dfrac{44}{7}+\dfrac{3}{7}\right)\cdot\dfrac{11}{5}=-2+\dfrac{3}{7}=-\dfrac{11}{7}\)
\(x\cdot\dfrac{44}{7}+\dfrac{3}{7}=-\dfrac{11}{7}:\dfrac{11}{5}=-\dfrac{5}{7}\)
\(\dfrac{44}{7}x=-\dfrac{5}{7}-\dfrac{3}{7}=-\dfrac{8}{7}\)
\(x=-\dfrac{8}{7}:\dfrac{44}{7}=-\dfrac{2}{11}\)
h) \(\dfrac{13}{4}x+\left(-\dfrac{7}{6}\right)x-\dfrac{5}{3}=\dfrac{5}{12}\)
\(\dfrac{25}{12}x-\dfrac{5}{3}=\dfrac{5}{12}\)
\(\dfrac{25}{12}x=\dfrac{5}{12}+\dfrac{5}{3}=\dfrac{25}{12}\)
\(x=1\)
Mỏi tay woa bn làm nốt nha!!
Trả lời
1)17-2(2x-3)=3
2(2x-3)=17-3
2(2x-3)=14
2x-3 =14:2
2x-3 =7
2x =7+3
2x =10
x =10:2
x =5
1) 17 - 2(2x - 3) = 3
=> 17 - 4x + 6 = 3
=> 23 - 4x = 3
=> 4x = 23 - 3
=> 4x = 20
=> x = 20 : 4 = 5
2) 125 - 5(3x - 1) = 25
=> 125 - 15x + 5 = 25
=> 130 - 15x = 25
=> 15x = 130 - 25
=> 15x = 105
=> x = 105 : 15
=> x = 7
3) 70 - 5(2x - 3) = 45
=> 70 - 10x + 15 = 45
=> 85 - 10x = 45
=> 10x = 85 - 45
=> 10x = 40
=> x = 40 : 10
=> x = 4
4) 231 - (x - 6) = 133 : 13
=> 231 - x + 6 = 133/13
=> 237 - x = 133/13
=> x = 237 - 133/13
=> x = 2948/13
\(1,17-2\left(2x-3\right)=3\)
\(\Rightarrow17-4x+6=3\)
\(\Rightarrow4x=20\Leftrightarrow x=5\)
\(2,125-5\left(3x-1\right)=25\)
\(\Rightarrow125-15x-5=25\)
\(\Rightarrow15x=95\Rightarrow x=3,8\)
\(3,70-5\left(2x-3\right)=45\)
\(\Rightarrow70-10x+15=45\)
\(\Rightarrow10x=45\Leftrightarrow x=4,5\)
\(4,231-\left(x-6\right)=\frac{133}{13}\)
\(\Rightarrow231-\frac{133}{13}=x-6\)
\(\Rightarrow x=237-\frac{133}{13}=\frac{2821}{13}\)
\(\left[\left(6x-72\right):2-84\right].28=5628\)
\(\left[\left(6x-72\right):2-84\right]=5628:28\)
\(\left[\left(6x-72\right):2-84\right]=210\)
\(\left(6x-72\right):2=210+84\)
\(\left(6x-72\right):2=294\)
\(\left(6x-72\right)=294.2\)
\(\left(6x-72\right)=588\)
\(6x=588+72\)
\(6x=660\)
\(x=660:6\)
\(x=110\)
5) 2448 : (119 - (x - 6)] = 24
=> 119 - x + 6 = 2448 : 24
=> 125 - x = 102
=> x = 125 - 102
=> x = 23
6) 15x - 13x = 882
=> 2x = 882
=> x = 882 : 2
=> x = 441
7) [(6x - 72) : 2- 84] . 28 = 5628
=> 3x - 36 - 84 = 5628 : 28
=> 3x - 120 = 201
=> 3x = 201 + 120
=> 3x = 321
=> x = 321 : 3
=> x = 107
8) 100 - 4(30 - 5x) = 20
=> 100 - 120 + 20x = 20
=> -20 + 2x = 20
=> 2x = 20 + 20
=> 2x = 40
=> x = 40 : 2
=> x = 20
\(5,2448\div\left[119-x+6\right]=24\)
\(\Rightarrow125-x=2448\div24\)
\(\Rightarrow125-x=102\Leftrightarrow x=23\)
\(6,15x-13x=882\)
\(\Rightarrow2x=882\Leftrightarrow x=441\)
\(7,\left[3x-36-84\right].28=5628\)
\(\Rightarrow3x-120=201\)
\(\Rightarrow3x=81\Leftrightarrow x=27\)
\(8,100-4\left(30-5x\right)=20\)
\(\Rightarrow100-120+20x=20\)
\(\Rightarrow20x=40\Leftrightarrow x=2\)
\(2448:\left[119-\left(x-6\right)\right]=24\)
\(\left[119-\left(x-6\right)\right]=2448:24\)
\(\left[119-\left(x-6\right)\right]=102\)
\(\left(x-6\right)=119-102\)
\(\left(x-6\right)=17\)
\(x=17+6\)
\(x=17+6=23\)
1) 17-2(2x-3)=3
2(2x-3)=17-3
2(2x-3)=14
2x-3=14:2
2x-3=7
2x=7+3
2x=10
x=10:2
x=5
vậy x=5
2) 125-5(3x-1)=25
5(3x-1)=125-25
5(3x-1)=100
3x-1=100:5
3x-1=20
3x=20+1
3x=21
x=21:3
x=7
vậy x=7
3)70-5(2x-3)=45
5(2x-3)=70-45
5(2x-3)=25
2x-3=25:5
2x-3=5
2x=5+3
2x=8
x=8:2
x=4
vậy=4
6)15x-13x=882
(15-13)x=882
2x=882
x=882:2
x=441
vậy x=441
8)100-4(30-5x)=20
4(30-5x)=100-20
4(30-5x)=80
30-5x=80:4
30-5x=20
5x=30-20
5x=10
x=10:2
x=5
vậy x=5