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x - 2.32 : 3 = 12
=> x - 18 : 3 = 12
=> x - 6 = 12
=> x = 6 + 12 = 18


a) \(x\left(x-1\right)=0\)
\(\Rightarrow x=0\) hoặc \(x-1=0\)
+) \(x=0\)
+) \(x-1=0\Rightarrow x=1\)
Vậy \(x\in\left\{0;1\right\}\)
b) \(\left(x+2\right)\left(x-4\right)=0\)
\(\Rightarrow x+2=0\) hoặc \(x-4=0\)
+) \(x+2=0\Rightarrow x=-2\)
+) \(x-4=0\Rightarrow x=4\)
Vậy \(x\in\left\{-2;4\right\}\)
c) \(x^3.x^2=2^8:2^3\)
\(\Rightarrow x^5=2^5\)
\(\Rightarrow x=2\)
Vậy \(x=2\)
d) \(3^{x-3}-3^2=2.3^2\)
\(\Rightarrow3^{x-3}=18+9\)
\(\Rightarrow3^{x-3}=27\)
\(\Rightarrow3^{x-3}=3^3\)
\(\Rightarrow x-3=3\)
\(\Rightarrow x=6\)
Vậy \(x=6\)

a) 32-6.(8-23)+18
= 32 - 6 . (8 - 8) +18
=32 - 0 +18
= 50
b) (3.5-9)3.(1+2.3)2+42
= (15-9 )3. (1+6)2 + 4 2
= 63 . 7 2 + 42
= 216 x 49 + 16
= 10584 + 16
=10600
c) 9234:[3.3.(1+83)]
= 9234 : [ 3.3.93]
= 9234 : [ 3.3 . 729]
= 9234 :6561
= 1,407407407
d) 76- {2.[2.52-(31-2.3)]}+3.25
= 76 - { 2. [ 2.52 - ( 31 - 6)]} + 3.25
= 76 - { 2 . [ 2. 52 - 25 ]} + 3 .25
= 76 - { 2 . [2. 25 - 25]} + 3.25
= 76 - { 2.[ 50 - 25 ]} + 3.25
= 76 - { 2. 25} + 3 . 25
= 76 - 50 + 3. 25
= 76 - 50 + 75
= 101


\(a,5:5^2+2^3.3^2\)
\(=5^4+72\)
\(=697\)
\(b,8^3.25-8^3.23\)
\(=8^3.\left(25-23\right)\)
\(=8^3.2\)
\(=1024\)
\(c,80-\left(4.5^2-3^2.2^3\right)\)
\(=80-\left(100-72\right)\)
\(=80-28\)
\(=52\)
\(d,\left(12^4-6^4+2.3^4\right):3^4\)
\(=\left(20736-1296+162\right):3^4\)
\(=19602:3^4\)
\(=242\)

\(a,5:5^2+2^3.3^2\)
\(=5+72\)
\(=77\)
\(b,8^3.25-8^3.23\)
\(=8^3.\left(25-23\right)\)
\(=8^3.2\)
\(=1024\)
\(c,80-\left(4.5^2-3^2.2^3\right)\)
\(=80-\left(100-72\right)\)
\(=80-28\)
\(=52\)
\(d,\left(12^4-6^4+2.3^4\right):3^4\)
\(=\left(20736-1296+162\right):3^4\)
\(=19602:3^4\)
\(=242\)