27.3^7:3^8
\(3-27.3^2-.....-27.3^{30}-27.3^{31}=?\)
Rút gọn biêu thức
A=3^2.45^4-15^3.9^3/3^3.45^4-5^4.3^10
B=6^30.3^11.7-2^31.5.3^40/2^28.17.3^38-6^27.3^11
C=35.27^8+70.9^11/15.81^6-60.3^20
D=4^6.6^7-9^3.8^6/12^5.2^8+18^3.32^3
a)27.3 mũ x = 3 mũ 10
b)60+3x=9 mũ 10:9 mũ 8
c)23-3(4+x)=3
a) 27 . 3x = 310
27 . 3x = 59049
3x = 59049 : 27
3x = 2187
3x = 37
x = 7
b) 60 + 3x = 910 : 98
60 + 3x = 92
60 + 3x = 81
3x = 81 - 60
3x = 21
x = 21 : 3
x = 7
c) 23 - 3(4+x ) = 3
3( 4 + x ) = 23 - 3
3( 4 + x ) = 20
Đề bài sai nha bạn
a) \(27.3^x=3^{10}\)
\(3^3.3^x=3^{10}\)
\(3^{3+x}=3^{10}\)
\(\Rightarrow3+x=10\)
\(\Rightarrow x=7\)
vậy \(x=7\)
b) \(60+3x=9^{10}:9^8\)
\(60+3x=9^{10-8}\)
\(60+3x=9^2\)
\(60+3x=81\)
\(3x=81-60\)
\(3x=21\)
\(x=7\)
vậy \(x=7\)
c) \(23-3\left(4+x\right)=3\)
\(23-12-3x=3\)
\(11-3x=3\)
\(3x=11-3\)
\(3x=8\)
\(x=\frac{8}{3}\)
vậy \(x=\frac{8}{3}\)
a) 27 . 3x = 310
27 . 3x = 59049
3x = 59049 : 27
3x = 2187
3x = 37
x = 7
b) 60 + 3x = 910 : 98
60 + 3x = 92
60 + 3x = 81
3x = 81 - 60
3x = 21
x = 21 : 3
x = 7
c) 23 - 3(4+x ) = 3
3( 4 + x ) = 23 - 3
3( 4 + x ) = 20
Đề bài sai nha bạn
P/s tham khảo nha
a) 5^3 = 125
b)3^4.3^3=3^7
c)27.3^2=243
d)49.7^2=2401
e) chịu -_-
1. Tìm x
a) 34 .3n=37
b)27.3n=243
c)49.7n=2041
a)34.3n = 37
34+n = 37
=> 4 + n = 7
n = 3
b) 27.3n = 243
33.3n = 243
33 + n = 35
=> 3 + n = 5
n = 2
c) 49.7n = 2041
72.7n = 2041
72 + n = 74
=> 2 + n = 4
n = 2
(3x-6).3=27.3
( 3x - 6 ) . 3 = 27 .3
( 3x - 6 ) . 3 = 81
3x - 6 = 81 : 3
3x - 6 = 27
3x = 27 + 6
3x = 33
x = 33 : 3
x = 11
Hok tốt nha
(3x-6).3 = 27.3
(3x-6).3 = 81
3x-6 = 81 : 3
3x-6 = 27
3x = 27 + 6
3x = 33
x = 33 : 3
x = 11
k mik nhé
Ta có : (3x-6).3=27.3
3x-6 = (27.3)/3=27
3x = 27+6=33
=> x = 33/3=11
Học tốt !
Tìm x
2x - 3 =17
4² - 3x =27.3 -77
48 + 2x = 3.2³
( 13x -12² ) : 5 =5
2x - 3 = 17
2x = 17 + 3
2x = 20
x = 20 : 2
x = 10
---------------
4² - 3x = 27.3 - 77
16 - 3x = 81 - 77
16 - 3x = 4
3x = 16 - 4
3x = 12
x = 12 : 3
x = 4
----------------
48 + 2x = 3.2³
48 + 2x = 3.8
48 + 2x = 24
2x = 24 - 48
2x = -24
x = -24 : 2
x = -12
----------------
(13x - 12²) : 5 = 5
13x - 144 = 5.5
13x - 144 = 25
13x = 25 + 144
13x = 169
x = 169 : 13
x = 13
\(2x-3=17\)
\(2x=17+3\)
\(2x=20\)
\(x=20:2\)
\(x=10\)
____
\(4^2-3x=27.3-77\)
\(16-3x=81-77\)
\(16-3x=4\)
\(3x=16-4\)
\(3x=12\)
\(x=12:3\)
\(x=4\)
_____
\(48+2x=3.2^3\)
\(48+2x=3.8=24\)
\(2x=24-48\)
\(2x=\left(-24\right)\)
\(x=\left(-24\right):2\)
\(x=\left(-12\right)\)
____
\(\left(13x-12^2\right):5=5\)
\(\left(13x-144\right):5=5\)
\(13x-144=5.5\)
\(13x-144=25\)
\(13x=25+144\)
\(13x=169\)
\(x=169:13\)
\(x=13\)
a.205-{102-[48-(16-14)mux3]}
b.{[10-2.3).5]+2-2.6}:2+(4+5)mũ2
c.(2 mũ3. 9 mũ 4+9 mũ3.45):(9 mũ 2.10-9 mũ 2)
d.18.[(3 mũ 4.24+3 mũ 4.4-27.3 mũ 4)-71.1 mũ 20]-8
25.5.4.57.2
58*76+24*58
265:5+27.3-43
a) 25.5.4.57
=(25.4).(2.5).57
= 100 . 10 .57
= 57000
b) 58.76+24.58
=58.(76+24)
=58.100
=5800
c) 265 : 5 + 27 . 3 - 43
= 265 : 5 + 27 . 3 - 64
= 53 + 81 - 64
= 70
a)9.5+8.10-27
b)36:9+100-27.3
c)29-[16+3.(51-49)]
\(a,9.5+8.10-27\)
\(=45+80-27\)
\(=125-27\)
\(=98\)
\(b,36:9+100-27.3\)
\(=4+100-81\)
\(=104-81\)
\(=23\)
\(c,29-\left[16+3.\left(51-49\right)\right]\)
\(=29-\left[16+3.2\right]\)
\(=29-\left[16+6\right]\)
\(=29-22\)
\(=7\)
a, 9.5 + 8.10 - 27
= 45 + 80 - 27
= 98
b, 36 : 9 + 100 - 27.3
= 4 + 100- 81
= 23
c, 29 - [ 16 + 3.( 51 - 49 ) ]
= 29 - [ 16 + 3. 2 ]
= 29 - 22
= 7