tìm số TN x , biết :
a)219-7(x+1)=100 b)(3x-6).3=3 mũ 4
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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, => 7.(x+1) = 219 - 100 = 119
=> x+1 = 119 : 7 = 17
=> x = 17 - 1 = 16
b, => 3x-6 = 3^4 : 3 = 3^3 = 27
=> 3x = 27+6 = 33
=> x = 33 : 3 = 11
k mk nha
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
a) 219-7(x+1)=100
7(x+1)=219-100
7(x+1)=119
x+1=119:7
x+1=17
=> x = 16
b)(3x-6).3 = 3^4
(3x-6).3 = 81
3x-6= 81:3
3x-6= 27
3x = 27-6
3x=21
=> x= 7.
kik nha
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 =\(\frac{16}{9}\)
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)
\(219-7\left(x+1\right)=100\)
\(\Rightarrow7\left(x+1\right)=119\)
\(\Rightarrow x+1=17\)
=> 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, \(219-7\left(X+1\right)=100\)
\(\Rightarrow219-7X-7=100\)
\(\Rightarrow7X=219-7-100=112\)
\(\Rightarrow X=112:7=16\)
b,\(\left(3X-6\right)x3=3^4\)
\(\Rightarrow3X-6=81:3=27\)
\(\Rightarrow3X=27+6=33\)
\(\Rightarrow X=33:3=11\)
c,\(3636:\left(12X-91\right)=36\)
\(\Rightarrow12X-91=3636:36=101\)
\(\Rightarrow12X=101+91=192\)
\(\Rightarrow X=192:12=16\)
Đúng luôn nên...hằng ngày k cho mk 3 lần, bao h đủ 100 lần thì tui nhé
a) 7(x+1)=219-100
x+1 = 119:7
x= 17 -1
x=16
b) (3x-6).3=34
3x-6 =33
3x =27+6
x=33:3
x= 11