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c) 10 . {[(x : 3 + 17) : 10 + 3 . 2^2] : 10} = 5
[(x : 3 + 17) : 10 + 3 . 4] : 10 = 5 : 10
[(x : 3 + 17) : 10 + 12] : 10 = 1/2
(x : 3 + 17) : 10 + 12 = 1/2 . 10
(x : 3 + 17) : 10 + 12 = 5
(x : 3 + 17) : 10 = 5 - 12
(x : 3 + 17) : 10 = -7
=> x : 3 + 17 = -7 . 10
x : 3 + 17 = -70
x : 3 = -70 - 17
x : 3 = -87
x = -87 . 3
x = -261
a ) \(\left(4x+5\right):3-121:1=4\)
\(\Leftrightarrow\left(4x+5\right):3-11=4\)
\(\Leftrightarrow\left(4x+5\right):3=15\)
\(\Leftrightarrow\left(4x+5\right)=45\)
\(\Leftrightarrow4x=40\)
\(\Leftrightarrow x=10\)
Tiếp tịch như z là đc
a ) sai đầu bài
b) 15. { 32 : [ 6 - 5 + 5 ( 9: 3 )]}
= 15 . { 32 : [ 6 - 5 + 5 . 3 ]}
= 15 . { 32 : [ 6 - 5 + 15 ] }
= 15 . { 32 : [ 1 +15 ] }
= 15 . { 32 : 16 }
= 15 . 2
= 30
bài 2:
a) 14
b)1024
Bài1:
b)15.{32:[6-5+5(9:3)]}
=15.{32:[6-5+5.3]}
=15.{32:[6-5+15]}
=15.{32:[1+15]}
=15.{32:16}
=15.2
=30
7x - x = 521: 519 + 3.22 - 70
=> 6x = 52 + 3.4 - 1
=> 6x = 25 + 12 - 1
=> 6x = 36
=> x = 36 : 6
=> x = 6
2x : 23 = 16
=> 2x = 16.23
=> 2x = 128
=> 2x = 27
=> x = 7
32x + 3 - 9x + 1 = 2.310
=> 32x + 3 - 32x + 2 = 2.310
=> 32x + 2. 3 - 32x + 2 = 2.310
=> 32x + 2. (3 - 1) = 2.310
=> 32x + 2.2 = 2.310
=> 32x + 2 = 310
=> 2x + 3 = 10
=> 2x = 10 - 3
=> 2x = 7
=> x = 7/2
a) \(7x-x=5^{21}:5^{19}+3.2^2-7^0\)
\(\Rightarrow6x=25+12-1\)
\(\Rightarrow x=6\)
b) \(2^x:2^3=16\)
\(\Rightarrow2^x=2^4.2^3=2^7\)
\(\Rightarrow x=7\)
c) \(3^{2x+3}-9^{x+1}=2.3^{10}\)
\(\Rightarrow9^x.27-9^x.9=2.3^{10}\)
\(\Rightarrow9^x.18=2.3^{10}\)
\(\Rightarrow9^x=3^8=9^4\)
\(\Rightarrow x=4\)
80-(4.25-3.8)=1024-x+4
80-(100-24)=1028-x
80-76=1028-x
4=1028-x
x=1028-4
x=1024
k cho mk nha
\(80-\left(4.5^2-3.2^3\right)=2^{10}-\left(x-4\right)\) )
=> \(80-\left[2^2\left(5^2-3.2\right)\right]=2^{10}-x+4\)
=> \(80-\left[2^2\left(25-6\right)\right]=2^{10}-x+4\)
=> \(80-\left(4.19\right)=2^{10}-x+4\)
=> \(80-76-4=2^{10}-x\)
=> \(2^{10}-x=0\)
=> \(x=1024\)
90-[4.52-3.23]=210-(x-40
90-[100-24]=210-(x-4)
90-76=210-(x-4)
14=1024-(x-4)
x-4=1024-14
x-4=1010
x=1010+4
x=1014
80 - (4.52 - 3.23) = 210 - (x - 4)
<=> 80 - (100 - 24) = 210 - (x - 4)
<=> 80 - 76 = 210 - (x - 4)
<=> 4 + x - 4 = 210
<=> x = 210
@Đức Đạt Đỗ (Đạt 301 Channel)
80-[2^2(5^2-6)]=2^10-(x-4)
80-(2^2.19)=2^10-x+4
80-76=2^10-x+4
\(\Rightarrow\)2^10-x+4=4
x+4=1024-4=1020
x=1020-4=1016
\(3.2+\left(x+5^2\right)=10^2\)
\(6+\left(x+25\right)=100\)
\(x+25=100-6=94\)
\(x=94-25=69\)
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