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Bo may la binh day k di hieu ashdbfgbgygygggydfsghuyfhdguuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu3
a) 25+x=0
x=0-25
x=-25
b)\(2^x:2^{19}=2^{25}\)
\(2^x=2^{25}.2^{19}\)
\(2^x=2^{44}\)
=>x=44
c)\(5^x.5^{18}=5^{54}\)
\(5^x=5^{54}:5^{18}\)
\(5^x=5^{36}\)
=>x=36
2. Tìm số tự nhiên x , biết:
a) ( 2600 + 6400 ) - 3 . x = 1200
<=> 9000 -3x = 1200
<=> 3x = 9000 - 1200
<=> 3x = 7800
=> x = 7800 : 3
=> x = 2600
1. a) 4.415.8.25.125
= (4.25). (8.125).415
= 100.1000.415
= 100000.415
= 41500000
b) 2.31.12+4.42.6+8.27.3
= (2.31.12)+(4.42.6)+(8.27.3)
= (2.12).31+(4.6).42+(8.3).27
= 24.31+24.42+24.27
= 24 (31+42+27)
= 24.100
= 2400
chờ chút nhé bn
a) \(\left(2x-25\right):13+51=8^2\)
\(\left(2x-25\right):13+51=64\)
\(\left(2x-25\right):13=64-51\)
\(\left(2x-25\right):13=13\)
\(\left(2x-25\right)=13.13\)
\(2x-25=169\)
\(2x=169+25\)
\(2x=194\)
\(x=194:2\)
\(\Rightarrow x=97\)
b) \(x^2:4+5^5:5^3=29\)
\(x^2:4+3125:125=29\)
\(x^2:4+25=29\)
\(x^2:4=29-25\)
\(x^2:4=4\)
\(x^2=4.4\)
\(x^2=16\)
\(x^2=4^2\)
\(\Rightarrow\orbr{\begin{cases}x=4\\x=-4\end{cases}}\)
a)
(2x-25):13+51=8^2
=> (2x-25):13+51=64
=> (2x-25):13=115
=> 2x-25 =115x13
=> 2x-25 =1495
=> 2x =1520
=> x =760
Vậy x=760
b)
x^2:4+5^5:5^3=29
=> x^2:4+5^2=29
=> x^2:4+25=29
=>x^2:4=4
=>x^2=16
=>x=4
Vậy x=4
a) \(\left(2,x-25\right)\div13+51=8^2\)
\(\left(2.x-25\right)\div13+51=64\)
\(\left(2.x-25\right)\div13=64-51\)
\(\left(2.x-25\right)\div13=13\)
\(\left(2x-25\right)=13.13\)
\(2x-25=169\)
\(2x=169-25\)
\(2x=144\)
\(x=144\div2\)
\(x=72\)
b)\(x^2\div4+5^5\div5^3=29\)
\(x^2\div4+5^2=29\)
\(x^2\div4+25=29\)
\(x^2\div4=29-25\)
\(x^2\div4=4\)
\(x^2=4\div4\)
\(x^2=1\)
\(x^2=1^2\)
\(\Rightarrow x=1\)