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a, 3.(x-9)+15=12+243:32
3x-27+15=12+243:9
3x-12=12+27
3x=12+12+27
3x=51
x=17
b, (3x-48).6=33.22+32.23-122
18x-288=32.3.22+32.22.2-(3.2.2)2
18x-288=32.3.22+32.22.2-32.22.22
18x-288= 32.22.(3+2-22)
18x-288= 9.4.(3+2-4)
18x-288=36.1
18x-288=36
18x=36+288
18x=324
x=18
Bài 1:
a, 96 \(⋮x=>x\inư\left(96\right)\)
b, \(2^x.15+2^x.17=4^{30}\)
\(2^x\left(15+17\right)=4^{30}\)
\(2^x.32=4^{30}\)
\(2^x.2^5=2^{60}\)
\(2^x=2^{60}:2^5\)
\(2^x=2^{55}\)
=> x = 55
1
3\(^5\).5\(^3\)-20.{300-[546-2\(^3\).(7\(^8\):7\(^6\)+7\(^0\))]}
= 243.125-20.{300-[546-8.(49+1)
= 243.125-20.[300-(546-8.50)
= 243.125-20.[300-(546-400)
= 243.125-20.(300-146)
= 243.125-20.154
= 30375-3080
= 27295
a. 1440 : [ 120 - (3x + 9 ) ] = 120
120 - (3x + 9) = 1440 : 120 = 12
3x + 9 = 120 - 12 = 108
3x = 108 - 9 = 99
x = 99 : 3 = 33
b. 120 + [ ( 999 - 9x ) : 60 ] . 24 = 480
[ ( 999 - 9x ) : 60 ] . 24 = 480 - 120 = 360
( 999 - 9x ) : 60 = 360 : 24 = 15
( 999 - 9x ) = 15 . 60 = 900
9x = 999 - 900 = 99
x = 99 : 9 = 11
1/ 3(x - 2) = 9 => x - 2 = 3 => x = 5
2/ 3(x - 36) = 216 => x - 36 = 72 => x = 108
3/ (x - 3)3 = 33 => x - 3 = 3 => x = 6
4/ 2x = 32 => 2x = 25 => x = 5
5/ 3x - 16 = 2.74 : 73 = 14 => 3x = 30 => x = 10
6/ (6x - 39) : 3 = 201 => 6x - 39 = 603 => 6x = 642 => x = 107
7/ (3x - 15)2 = 81 => (3x - 15)2 = 92 => 3x - 15 = 9 => 3x = 24 => x = 8
8/ 3(x + 4) = 105 => x + 4 = 35 => x = 31
9/ 12x - 43 = 4.84 : 83 = 32 => 12x = 32 : 64 => 12x = 1/2 => x = 1/24
10/ 41 - (2x - 5) = 680 => 2x - 5 = -639 => 2x = -634 => x = - 317
\(A,\left(a^6\right)^4.a^{12}=a^{24}.a^{12}=a^{36}\)
\(B,5^6:5^3+3^3.3^2=5^3+3^5=125+243=368\)
Tìm X
\(A,\left(x-1\right)^3=125=5^3\)
\(x-1=5\)
\(\Rightarrow x=6\)
\(B,720:\left[41-\left(2x-5\right)\right]=2^3.5=40\)
\(\Leftrightarrow41-\left(2x-5\right)=\frac{720}{40}=18\)
\(\Leftrightarrow2x-5=23\)
\(\Leftrightarrow x=\frac{28}{2}=14\)