5x.7.5x+1= 875
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.

Những câu hỏi liên quan

17 tháng 12 2020
Ta có: \(9\cdot5^{x-2}+7\cdot5^{x-1}-5^x=2375\)
\(\Leftrightarrow5^x\cdot\dfrac{9}{25}+5^x\cdot\dfrac{7}{5}-5^x\cdot1=2375\)
\(\Leftrightarrow5^x\cdot\dfrac{19}{25}=2375\)
\(\Leftrightarrow5^x=2375:\dfrac{19}{25}=2375\cdot\dfrac{25}{19}=3125\)
\(\Leftrightarrow5^x=5^5\)
hay x=5
Vậy: x=5

12 tháng 9 2015
(5+6,5)x = 875-1-1
11,5x = 873
x = 873:11,5
x = \(\frac{1746}{23}\)
LL
0

HV
0



24 tháng 7 2017
A, 32 * 47 + 32 * 53
= 32 * ( 47 + 53 )
= 32 * 100
= 3200 .
B, 875 + 5375 : 25 - 875
= 875 - 875 + 5375 : 25
= 0 + 2115
= 215 .
C, 5 * 25 * 2 * 16 * 4
= ( 5 * 2 * 16 ) * ( 25 * 4 )
= 160 * 100
= 16000 .
BH
2

\(5^x.7.5^{x+1}=875\)
\(\Leftrightarrow5^x.5^{x+1}=125\)
\(\Leftrightarrow5^{2x+1}=5^3\)
\(\Leftrightarrow2x+1=3\)
\(\Leftrightarrow2x=2\Leftrightarrow x=1\)