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
