tìm x: 219-7x(x+1)=100
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(219-7\left(x+1\right)=100\)
\(=>219-7x-7=100\)
\(=>-7x+212=100\)
\(=>-7x=-112\)
\(=>x=16\)
Ai T mik nói vs mik mik sẽ T lại
Thanks nha
\(219-7\left(x+1\right)=100\)
\(\Leftrightarrow219-7x-7=100\)
\(\Leftrightarrow-7x=100-219+7\)
\(\Leftrightarrow-7x=-112\Leftrightarrow x=16\)
(k cho mình với nhé!)
![](https://rs.olm.vn/images/avt/0.png?1311)
219-7(x+1)=100
7(x+1)= 219-100
7(x+1)=119
x+1 = 119 : 7
x+1 = 17
x = 17-1
x = 16
![](https://rs.olm.vn/images/avt/0.png?1311)
219 - 7(x + 1) = 100
7(x + 1) = 219 - 100
7(x + 1) = 119
x + 1 = 119 : 7
x + 1 = 17
x = 17 - 1
x = 16
\(219-7\left(x+1\right)=100\)
\(\Rightarrow7\left(x+1\right)=119\)
\(\Rightarrow x+1=17\)
\(\Rightarrow x=16\)
Vậy \(x=16\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 5 - x = 8
=> x = -3
Vậy x = -3
b) x - ( -2 ) = 16
=> x + 2 = 16
=> x = 14
Vậy x = 14
c) 219 - ( x + 1 ) = 100
=> x + 1 = 119
=> x = 118
Vậy x = 118
a) 5 - x = 8
x = 5 - 8
x = -3
b) x - ( - 2 ) = 16
x + 2 = 16
x = 16 - 2
x = 14
c) 219 - ( x + 1 ) = 100
x + 1 = 219 - 100
x + 1 = 119
x = 119 - 1
x = 118
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 7[x+1]=219-100
7[x+1]=119
[x+1]=119:7
[x+1]=17
+,x+1=17 =>x=17-1=16
+,x+1=(-17) =>x=(-17)-1=-18
Vậy x=16;x=-18
b) [3x-6].3= 34
[3x-6] = 33=27
+, 3x-6=27=>3x=27+6
3x=33
x=33:3
x=11
+, 3x-6=(-27)=>3x=(-27)+6
3x=(-21)
x=(-21):3
x=-7
Vậy x=11;x=(-7)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 219 – 7(x + 1) =100
7(x+1) = 219 -100
7(x+1) = 119
x + 1 = 119:7
x + 1 = 17
x = 17-1
x = 16
b) (3x – 6).3 = 34
3x – 6 = 34 : 3
3x – 6 = 33
3x = 27 + 6
3x = 33
x = 11
a ) 219 - 7( x + 1 ) = 100
7 ( x + 1 ) = 219 - 100
7 ( x + 1 ) = 119
x + 1 = 119 : 7
x + 1 = 17
x = 17 - 1
x = 16
b ) ( 3x - 6 ) . 3 = 34
( 3 x - 6 ) . 3 = 81
3x - 6 = 81 : 3
3x - 6 = 27
3x = 27 + 6
3x = 33
x = 33 : 3
x = 11
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
<=> 219 - 7x - 7 = 100
<=> -7x = 100 - 219 + 7
<=> -7x = -112
<=> x = -112 : (-7)
<=> x = 16
b)
<=> 9x - 18 = 34
<=> 9x = 34 + 18
<=> 9x = 52
<=> x = 52 : 9
<=> x = 52/9
a)219-7(x+1)=100
7(x+1)=219-100
7(x+1)=119
x+1 =119:7
x+1 =17
x =17-1
x =16
b) (3x-6).3=34
3x-6 =34:3
3x-6 =\(\frac{34}{3}\)
3x =\(\frac{34}{3}\)- 6
3x =\(\frac{16}{3}\)
x =\(\frac{16}{3}\): 3
x =\(\frac{16}{9}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)219-7(x+1)=100
7(x+1)=219-100
x+1=119/7
x+1=17
x=17-1
x=16
b)(3x-6)*3=64
3x-6=64/3
3x=64/3+6
3x=82/3
x=82/3:3
x=82/9
a) 219-7(x+1)=100
219-7x-7=100
-7x=100-219+7
-7x=-112
x=16
b) (3x-6).3=64
3x-6=64/3
3x=82/3
x=82/9
19-7.(x+1)=100
7.(x+1) = 219 -100
7.(x+1)=119
x+1=119:7
x+1=17
x=17-1
x=16
minh lam the chac 100% la dung