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\(25+5x-4^3=251\)
\(\Rightarrow25+5x=315\)
\(\Rightarrow5x=315-25\)
\(\Rightarrow5x=290\)
\(\Rightarrow x=290:5=58\)
\(25+x.5-4^3=251\)
\(\Rightarrow25+x.5-64=251\)
\(\Rightarrow x.5=251+64-25\)
\(\Rightarrow x.5=290\)
\(\Rightarrow x=58\)
Vậy \(x=58\)
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a,113-3+20
=1328+20
=1348
b,300+7781+1425
=9506
c,7+36-40
=43-40=3
a,
115 : 112 - 33 : ( 11 + 23 ) + 22 x 30 x 5
= 11( 5 - 2 ) - 27 : ( 1 + 8 ) + 4 x 1 x 5
= 113 - 27 : 9 + 4 x 5
= 1331 - 3 + 20
= 1328 + 20
= 1348
b,
12 x 25 + 31 x 251 + 57x 25
= 12 x 25 + 57 x 25 + 31 x 251
= ( 12 + 57 ) x 25 + 31 x 251
= 69 x 25 + 31 x 251
= 1725 + 7781
= 9506
c,
15 - 23 + 4 x 32 - 5 x 8
= 15 - 8 + 4 x 9 - 40
= 15 - 8 + 36 - 40
= 7 + 36 - 40
= 43 - 40
= 3
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Ta có: \(25.5x=\left(5^3\right)^4\)
\(\Rightarrow125x=5^{12}\)
\(\Rightarrow5^3.x=5^3.5^9\)
\(\Rightarrow x=5^9\)
\(25.5x=\left(5^3\right)^4\)
\(5^3x=5^{12}\)
\(\Rightarrow x=5^{12}:5^3=5^9\)
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a. 8x+2x =25. 2 mũ 2
8x+2x=100
(8+2)x=100
10x=100
x=100:10
x=10
b.5x+2x=35
(5+2)x=35
7x=35
x=35:7
x=5
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a) 8x + 2x = 25 . 22
8x + 2x = 100
( 8 + 2 )x = 100
10x = 100
x = 100 : 10
x = 10
b) 5x + 2x = 35
( 5 + 2 )x = 35
7x = 35
x = 35 : 7
x = 5
c) 5x + x = 150 : 2 + 3
5x + x = 75 + 3
5x + x = 78
( 5 + 1 )x = 78
6x = 78
x = 78 : 6
x = 13
d) 6x + x = 511 : 59 + 31
6x + x = 52 + 31
6x + x = 25 + 3
6x + x = 28
( 6 + 1 )x = 28
7x = 28
x = 28 : 7
x = 4
e) 5x + 3x = 36 : 33 . 4 + 12
5x + 3x = 33 . 4 + 12
5x + 3x = 27 . 4 + 12
5x + 3x = 108 + 12
5x + 3x = 120
( 5 + 3 )x = 120
8x = 120
x = 120 : 8
x = 15
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75 x ( 42015 + 42014 + 42013 + .... 4 + 1 ) +25
= 25 x 3 x (4 2015 + 42014 + ... 1 ) + 25
= 25 x 3 + 25 x ( 42015+ .... + 1)
= 100 x ( 42015+42014 + ..... + 1 )
=> chia hết cho 100
Mìn đang nghĩ bài 1 , nếu làm được mìn sẽ giúp
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bài 1
a)
=> 3(x-2)=60-51
=> 3(x-2) =9
=> x-2 =9:3
=> x-2 =3
=> x =3+2
=> x =5
b)
=>4x-20=25-2
=>4x-20=23
=>4x-20=8
=>4x=8+20
=>4x=28
=>x=28:4
=>x=7
c)
=> 25+x.5-64=251
=> x.5-64 =251-25
=> x.5-64 =226
=> x.5 =226+64
=> x.5 =290
=> x =290:5
=> x =58
d)
=> [(14)2 - (12)2].2x=1872
=> 52.2x =1872
=> 104x =1872
=> x = 1872:104
=> x=18
e)
x10=x
=> x10-x=0
=>x(x9-1)=0
=>\(\orbr{\begin{cases}x=0\\x^9-1=0\end{cases}\Rightarrow\orbr{\begin{cases}x=0\\x^9=1\Rightarrow x=1\end{cases}}}\)
nha
mình sẽ làm típ
T I C K cho mình mình sẽ làm típ
25 + 5x - 43 = 251
5x - 43 = 251 - 25
5x - 43 = 226
5x = 226 - 43 = 226 - 64
5x = 162
x = 162 : 5 = 32,4
25+5x-43=251
-> 5x - 43 = 251 - 25
-> 5x - 64 = 226
-> 5x = 226 + 64
-> 5x = 290
-> x = 290 : 5
-> x = 58