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a,4.52-3.2+ 33 : 32= 4* 5^2 - 3*(2+1)= 100 - 9 = 91
b,150: [25.( 18-42 )= 150 : (25 * 2) = 3
c,S=1+3+5....99
= (1+99) +(3+ 97) +....+ (47 + 53) + (49 + 51)
= 100 * 25
= 2500
d,125+70+375+230= (125+ 375) +(70 + 230) = 500 + 300 = 800
e,315-64:23 = 135 -8 = 127
f,6x-5=31
6x = 36
x=6
g,2.14.(x-5)=28
28 (x-5) = 28
x-5 =1
x=6
a,4.52-3.2+33: 32=97
b,150: [25.( 18-42 )=3
c,s=1+3+5....99=2500
d,125+70+375+230=800
e,315-64:23=307
f,6x-5=31=>x=6
g,2.14.(x-5)=28=>x=6
cik cho mik nha bn!
\(35-3^{x+1}=8\)
\(\Rightarrow3^{x+1}=35-8=27\)
Mà \(27=3^3\)
\(\Rightarrow x+1=3\Rightarrow x=3-1=2\)
Vậy \(x=2\)
\(a.35-3^{x+1}=8\)
\(3^x.3^1=35-8\)
\(3^x.3^1=27\)
\(3^x.3^1=3^3\)
\(3^x=3^3:3^1\)
\(3^x=3^{3-1}\)
\(3^x=3^2\)
\(\Rightarrow x=2\)
\(b.3.2^{x-1}+5=29\)
\(3.2^x:2^1=29-5\)
\(3.2^x:2^1=24\)
\(2^x:2^1=24:3\)
\(2^x:2^1=8\)
\(2^x:2^1=2^3\)
\(2^x=2^3.2^1\)
\(2^x=2^{3+1}\)
\(2^x=2^4\)
\(\Rightarrow x=4\)
\(c.9:3^x+15=18\)
\(3^2:3^x+15=18-15\)
\(3^2:3^x=3\)
\(3^x=3^2:3\)
\(3^x=3^{2-1}\)
\(3^x=3^1\)
\(\Rightarrow x=1\)
Chúc bạn học tốt!
( 5x+1 - 61 ) = 24 . 22
( 5x+1 - 61 ) = 26
( 5x+1 - 61 ) = 64
5x+1 = 64 + 61
5x+1 = 125
5x +1 = 53
x + 1 = 3
x = 3 - 1
x = 2
64.2x-2=22020
26.2x:22=22020
26.2x =22020.22
26.2x =22022
2x =22022:26
2x =22018
21+3.\(|\)x\(|\)=3.(42-1)
21+3.\(|\)x\(|\)=3.15
21+3.\(|\)x\(|\)=45
3.\(|\)x\(|\)=45-21
3.\(|\)x\(|\)=24
\(|\)x\(|\)=24:3
\(|\)x\(|\)=8
\(|\)x\(|\)=\(|\)8;-8\(|\)
=>x\(\in\){8;-8}
Chúc bn học tốt
\(a,\left(27x+6\right):3-11=9\)
\(\Rightarrow\left(27x-6\right):3=20\)\(\Rightarrow27x-6=60\)\(\Rightarrow27x=66\)\(\Rightarrow x=\frac{22}{9}\)
\(b,\left(15-6x\right).3^5=3^6\)
\(\Rightarrow15-6x=3\)\(\Rightarrow6x=12\)\(\Rightarrow x=2\)
\(c,\left(2x-6\right).4^7=4^9\)
\(\Rightarrow2x-6=16\)\(\Rightarrow2x=22\)\(\Rightarrow x=11\)
Bài 1: Tìm x
a,(27.x+6):3-11=9
﴾ 27x + 6﴿ : 3 ‐ 11 = 9
﴾ 27x + 6﴿ : 3 = 20
27x + 6 = 60
27x = 54
x = 54 : 27
x = 2
Vậy x = 2
b,( 15-6x ) . 35=36
( 15 - 6x ) = 36 : 35
15 - 6x = 3
6x = 15 - 3
6x = 12
x = 12 : 6
x = 2
Vậy x = 2
c,( 2x-6 ) . 47=49
2x - 6 = 49 : 47
2x - 6 = 16
2x = 16 + 6
2x = 22
x = 22 : 2
x = 11
Vậy x = 11
4x+1= 43
<=>x+1 = 3
<=>x= 3-1
<=>x=2
vậy x= 2
4x+1 = 64
suy ra : 64 = 43
Vậy : 3 - 1 = 2 . Nên 42+1 = 43 = 64