Tìm x biết:
a) 22+x=52
b) 2x-3=45
c)4 mũ x = 64
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\(a,\Rightarrow x=30-18=12\\ b,\Rightarrow x+6=45:5=9\\ \Rightarrow x=9-6=3\\ c,\Rightarrow38-3x=4^2=16\\ \Rightarrow3x=38-16=22\\ \Rightarrow x=\dfrac{22}{3}\)
a: \(\left(x-1\right)^3+\left(2-x\right)\left(4+2x+x^2\right)+3x\left(x+2\right)=16\)
=>\(x^3-3x^2+3x-1+8-x^3+3x^2+6x=16\)
=>9x+7=16
=>9x=9
=>x=1
b: \(x\left(x-5\right)\left(x+5\right)-\left(x+2\right)\left(x^2-2x+4\right)=17\)
=>\(x\left(x^2-25\right)-\left(x^3+8\right)=17\)
=>\(x^3-25x-x^3-8=17\)
=>-25x=8+17=25
=>x=-1
c: \(x^3-12x^2+48x-64=0\)
=>\(\left(x-4\right)^3=0\)
=>x-4=0
=>x=4
c: Ta có: \(x^3-12x^2+48x-64=0\)
\(\Leftrightarrow x-4=0\)
hay x=4
c: Ta có: \(x^3-12x^2+48x-64=0\)
\(\Leftrightarrow x-4=0\)
hay x=4
a: \(\left(x-1\right)^3+\left(2-x\right)\left(4+2x+x^2\right)+3x\left(x+2\right)=16\)
=>\(x^3-3x^2+3x-1+8-x^3+3x^2+6x=16\)
=>9x+7=16
=>9x=9
=>x=1
b: \(x\left(x-5\right)\left(x+5\right)-\left(x+2\right)\left(x^2-2x+4\right)=17\)
=>\(x\left(x^2-25\right)-\left(x^3+8\right)=17\)
=>\(x^3-25x-x^3-8=17\)
=>-25x=8+17=25
=>x=-1
c: \(x^3-12x^2+48x-64=0\)
=>\(x^3-3\cdot x^2\cdot4+3\cdot x\cdot4^2-4^3=0\)
=>\(\left(x-4\right)^3=0\)
=>x-4=0
=>x=4
a) 22+x=52
x=52-22
x=30
b) 2x-3=45
2x=45+3
2x=48
x=48:2
x=24
c)4x = 64
4x=43
\(\Rightarrow x=3\)
a) 22+x=52
x=52-22
x=30
b) 2x-3=45
2x=45+3
2x=48
x=48 : 2
x=24
c) \(4^x=64\)
\(4^x=4^3\)
=> x=3