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(3x-6).3=81
(3x-6)=81:3
(3x-6)=27
3x=27+6
3x=33
x=33:3
x=11
tớ chắc chắn mình làm đúng hãy tin tưởng tớ
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 =\(\frac{16}{9}\)
219 - 7(x+1)=100 (3x-6).3=34
=> 7(x+1)=219-100 => 3x-6=34:3
=> 7(x+1)=119 => 3x-6=32=9
=> x+1=119:7 => 3x=9+6
=> x+1=17 => 3x=15
=> x=17-1 => x=15:3
=> x=16 => x=5
Vậy x=16 Vậy x=5
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).3=81
3x-6=81:3
3x-6=17
3x=27+6
3x=33
x=33:3
x=11
li-ke cho mình nha Duong Thi Hoai My
a)
\(219-7\left(x+1\right)=100\)
\(\Rightarrow7\left(x+1\right)=119\)
\(\Rightarrow x+1=17\)
=> x = 16
Vậy x = 16
b)
\(\left(3x-6\right)3=3^4\)
\(\Rightarrow\left(x-2\right)3^2=3^4\)
=> x - 2 = 9
=> x = 7
Vậy x = 7
a. 219 - 7(x+1) = 100
7(x+1)=119
x+1=119:7
x+1=17
x=16
Vậy x=16
b. (3x - 6) . 3 = 34
3x-6=34:3
3x-6=33
3x=33
x=11
Vậy x=11
a) \(219-7\left(x+1\right)=100\)
\(\Leftrightarrow219-7x-7=100\)
\(\Leftrightarrow-7x=100-219+7=-112\)
\(\Leftrightarrow x=16\)
b) \(\left(3x-6\right)\cdot3=3^4\)
\(\Leftrightarrow\left(x-2\right)\cdot3^2=3^4\)
\(\Leftrightarrow x-2=3^2\)
\(\Leftrightarrow x=9+2=11\)
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
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-6=27
=> 3x=27+6
=> 3x=33
=> x=33:3
=> 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
=> 3x-6=34:3
=> 3x-6=33
=> 3x-6=27
=> 3x=27+6
=> 3x=33
=> x=33:3
=> x=11