Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a)
2x - 138 = 23 . 32
2x - 138 = 8 . 9
2x - 138 = 72
2x = 72 + 138
2x = 110
x = 110 : 2
x = 55
còn lại tương tự
\(a,2x-138=2^3-3^2\)
\(2x-138=8-9\)
\(2x-138=-1\)
\(2x=-1+138\)
\(2x=137\)
\(x=137:2\)
\(x=68,5\)
\(Vậyx=68,5\)
\(b,\left[3.\left(x+2\right):7\right].4=120\)
\(3x+6:7=120:4\)
\(3x+\frac{6}{7}=30\)
\(3x=30-\frac{6}{7}\)
\(3x=\frac{204}{7}\)
\(x=\frac{204}{7}:3\)
\(x=\frac{204}{7}.\frac{1}{3}\)
\(x=\frac{68}{7}\)
\(Vậyx=\frac{68}{7}\)
\(c,\left\{\left[\left(2x+14\right):2^2-3\right]:2\right\}-1=0\)
\(\left\{\left[\left(2x+14\right):4-3\right]:2\right\}=0+1\)
\(\left[\left(2x+14\right):4-3\right]:2=1\)
\(\left(2x+14\right):4-3=1.2\)
\(\left(2x+14\right):4-3=2\)
\(\left(2x+14\right):4=2+3\)
\(\left(2x+14\right):4=5\)
\(2x+14=5.4\)
\(2x+14=20\)
\(2x=20-14\)
\(2x=6\)
\(\Rightarrow x=6:2\)
\(x=3\)
\(Vậyx=3\)
a) pt <=> \(\frac{x\left(x+1\right)}{2}=500500\)
<=> \(x^2+x=1001000\)
<=> \(x^2-1000x+1001x-1001000=0\)
<=> \(\left(x-1000\right)\left(x+1001\right)=0\)
<=> \(\orbr{\begin{cases}x=1000\\x=-1001\end{cases}}\)
Do \(x>0\)=> \(x=1000\)
b)
<=> \(2x=210\)
<=> \(x=105\)
c)
<=> \(6x-81=3.7\)
<=> \(x=17\)
d)
<=> \(125-5\left(3x-1\right)=5^2\)
<=> \(5\left(3x-1\right)=100\)
<=> \(3x-1=20\)
<=> \(x=7\)
e)
<=> \(4^{x+1}+1=65\)
<=> \(4^{x+1}=64\)
<=> \(x+1=3\)
<=> \(x=2\)
j)
<=> \(2\left(2x-3\right)=14\)
<=> \(2x-3=7\)
<=> \(x=5\)
a) \(2x-2^3.3^2=138\)
\(\Rightarrow2x=138+2^3.3^2\)
\(\Rightarrow2x=210\)
\(\Rightarrow x=105\)
Vậy x = 105.
a)2x-96=138
2x=174
x=87
b)(6x-81).343=147
2058x-27783=147
2058x=27930
x=13,57
a) 2 .x - 138 = 23 . 32
2.x - 138 = 8 . 9
2.x -138 = 72
2.x = 72 + 138
2.x =210
x = 210 : 2
x = 105
Các cau còn lại tương tự. L-I-K-E nha các bạn! Thanks
3x-1 = 81 8x+2 = 512 3x = 33 . 35
3x-1 = 34 8x+2 = 83 3x = 38
=> x - 1 = 4 => x + 2 = 3 => x = 8
x = 5 x = 1
2x . 3x = 4 . 9 2.x - 138 = 23 . 32
(2.3)x = 22 . 32 2.x - 138 = 8 . 9
6x = (2.3)2 2.x - 138 = 72
6x = 62 2.x = 210
=> x = 2 => x = 105
4x < 120 3x > 81 15 < 2x < 70
=> 4x nhỏ hơn băng 64 => 3x > 34 => 23 < 2x < 26
=> 4x nhỏ hơn bằng 43 => x > 4 => 3 < x < 6
=> x \(\in\) {0;1;2;3} => x \(\in\) {4;5;6;7; ... } => x \(\in\) {4;5}
Ta có : (6x - 34) . 73 = 3.74
=> (6x - 34) = 3.7
=> (6x - 34) = 21
=> 6x - 81 = 21
=> 6x = 102
=> x = 17
<div style="position:relative;height:0;padding-bottom:56.25%"><iframe src="https://www.youtube.com/embed/koxpMVzDZhk?ecver=2" width="640" height="360" frameborder="0" style="position:absolute;width:100%;height:100%;left:0" allowfullscreen></iframe></div>
(105–x) : 23=30+1
(105–x) : 8 =3+1
(105–x) : 8 =4
105–x. =4.8
105–x. =36
x. =105–36
x. =69
2x—138=22.32
2x—138=(2.3)2
2x—138=62
2x—138=36
2x. =36+138
2x. =174
x=174:2
x=87