Tìm x, biết: \(5.3^x=8.3^9+7.27^3\)
5 .3^x=8.3^9+7.27^3
5.\(3^x\) = 8.39 + 7.273
5.\(3^x\) = 8.39 + 7.(33)3
5.\(3^x\) = 8.39 + 7.39
5.\(3^x\) = 39.( 8 + 7)
5.\(3^x\) = 39. 15
\(3^x\) = 39.15:5
\(3^x\) = 39.3
\(3^x\)= 310
\(x\) = 10
Vậy \(x\) = 10
1) TÍNH
( 1253 . 75 - 1755 : 5 ) : 20162017
2) TÌM x , y
a) 5.3x = 8.39 + 7.273
b) 2x + 624 = 5y
Phần trong ngoặc.........phân tích cơ số ra thừa số nguyên tố:
\(125^3\cdot7^5-175^5:5=\left(5^3\right)^3\cdot7^5-\left(5^2\cdot7\right)^5:5=5^9\cdot7^5-5^9\cdot7^5=0\)
1) ( 1253 . 75 - 1755 : 5 ) : 20162017 = 0: 2016^2017 = 0
2)
a)5* 3^x = 8*3^9 + 8* 27^3
3^x = 59049
x=10
1) = 0
2) a = 10
b) khó qá bn ạk
mk chẳng hiểu đề lắm
nha bn
Đề:
Tìm số nguyên x, biết:
a) \(\frac{-5}{6}\) + \(\frac{8}{3}+\frac{29}{-6}\) ≤ x ≤ \(\frac{-1}{2}+2+\frac{5}{2}\)
b) \(5.3^x\) = \(8.3^9+7.27^3\)
Câu b
\(5\cdot3^x=8\cdot3^9+7\cdot27^3\)
\(\Leftrightarrow5\cdot3^x=8\cdot3^9+7\cdot\left(3^3\right)^3\)
\(\Leftrightarrow5\cdot3^x=8\cdot3^9+7\cdot^9\)
\(\Leftrightarrow5\cdot3^x=15\cdot3^9\)
\(\Leftrightarrow3^x=3\cdot3^9=3^{10}\)
Vậy \(x=10\)
#kido
1. Tìm số tự nhiên x biết
a. 37-7.(x+1)=40-8.3
b. (x+5).3+11=10+(3+4).4
c. 25-5.3+4.10=100-5.x
d. 36+2.(x-7)=12+8.(3+5)-36
e. 3.(x+7)-9=11.5-5-8
(ai biết giúp mình, mình tick cho nhé)
a. 37-7.(x+1)=40-8.3
37 - 7(x+1) = 16
7(x+1) = 21
x+1 = 3
x=2
b. (x+5).3=11=10+(3+4).4
(sao có 2 dấu bằng, dấu nào là dấu cộng do viết nhầm ???)
c. 25-5.3+4.10=100-5.x
50 = 100 - 5x
5x = 50
x=10
d. 36+2.(x-7)=12+8.(3+5)-36
36 + 2(x-7) = 40
2(x-7) = 4
x-7 =2
x=9
e. 3.(x+7)-9=11.5-5-8
3(x+7) - 9 = 42
3(x+7) = 51
x+7 = 17
x=10
tim x biet
X+35=-22-X
(6X-4^2) .7^8=2.7^9
5.3^x-1-7.3^12=8.3^12
3.(x-15)^3=-24
lx+18l=10
5.3^x =8.3^10-3.3^10
5.3x = 8.310 - 3.310
<=> 5.3x = ( 8-3 ) . 310
<=> 5.3x = 5 .310
<=> x = 10
tìm x
a, 5.3x=8.39+7.273
b, 52x-3-2.52=52.3
c, 6x+6x+1+6x+2=1548
d, (x-32).45=0
e, 2+4+6+8+...+2x=210
so sánh
7150 và 3775
nhanh nhé khoảng 15 phút nữa thôi (mỗi bạn làm 1 ý cũng được)
a. 5x3^x= 8x19683+7x19683
5x3^x=(8+7)x19683
5x3^x=15x19683
5x3^x= 295245
3^x=295245:5
=59049
3^x= 3^10
vậy x=10
d.x-32=0:45
x-32=0
x=0+32
x=32
tìm x biết x-9^8.3-9^9 phần 9^8.5+9^8.7=0
1 tìm x
\(\dfrac{15-x}{8}=\dfrac{x-23}{10}\)
\(5.3^x=8.3^{^{ }9}\)
\(\dfrac{1}{2}\left|2x-1\right|-3\dfrac{2}{5}=\left(\dfrac{-1}{2}\right).\left(2015\right)^0\)
*** \(\dfrac{15-x}{8}=\dfrac{x-23}{10}\)
\(\Rightarrow10\left(15-x\right)=8\left(x-23\right)\)
\(\Rightarrow150-10x=8x-184\)
\(\Rightarrow150+184=10x+8x\)
\(\Rightarrow18x=334\)
\(\Rightarrow x=\dfrac{167}{9}\)
*** \(\dfrac{1}{2}\left|2x-1\right|-3\dfrac{2}{5}=\left(-\dfrac{1}{2}\right).\left(2015\right)^0\)
\(\Rightarrow\dfrac{1}{2}\left|2x-1\right|-3\dfrac{2}{5}=\left(-\dfrac{1}{2}\right).1\)
\(\Rightarrow\dfrac{1}{2}\left|2x-1\right|-3\dfrac{2}{5}=\left(-\dfrac{1}{2}\right)\)
\(\Rightarrow\dfrac{1}{2}\left|2x-1\right|-3\dfrac{2}{5}=\left(-\dfrac{1}{2}\right)\)
\(\Rightarrow\dfrac{1}{2}\left|2x-1\right|=\left(-\dfrac{1}{2}\right)+3\dfrac{2}{5}\)
\(\Rightarrow\dfrac{1}{2}\left|2x-1\right|=\dfrac{29}{10}\)
\(\Rightarrow\left|2x-1\right|=\dfrac{29}{10}:\dfrac{1}{2}\)
\(\Rightarrow\left|2x-1\right|=\dfrac{29}{5}\)
\(\Rightarrow\left[{}\begin{matrix}2x-1=\dfrac{29}{5}\\2x-1=-\dfrac{29}{5}\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}2x=\dfrac{34}{5}\\2x=-\dfrac{24}{5}\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=\dfrac{17}{5}\\x=-\dfrac{12}{5}\end{matrix}\right.\)