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a: =>2^4x<2^28
=>4x<28
=>x<7
b: =>5^3x+3<5
=>3x+3<1
=>3x<-2
=>x<-2/3
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a) \(\left(2x-18\right):\left(-10\right)-34=2\)
\(\Rightarrow\left(2x-18\right):\left(-10\right)=2+34\)
\(\Rightarrow\left(2x-18\right):\left(-10\right)=36\)
\(\Rightarrow2x-18=36\cdot\left(-10\right)\)
\(\Rightarrow2x-18=-360\)
\(\Rightarrow2x=-360+18\)
\(\Rightarrow2x=-342\)
\(\Rightarrow x=-342:2\)
\(\Rightarrow x=-171\)
b) \(120:\left(5x+20\right)-45=75\)
\(\Rightarrow120:\left(5x+20\right)=75+45\)
\(\Rightarrow120:\left(5x+20\right)=120\)
\(\Rightarrow5x+20=120:120\)
\(\Rightarrow5x+20=1\)
\(\Rightarrow5x=1-20\)
\(\Rightarrow5x=-19\)
\(\Rightarrow x=-\dfrac{19}{5}\)
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B3 a) x=4 b) x=-7 c) x=5 d) x=4
B2 a) -3+ -2+ -1+0+1+2+3+4=4
b) -6+ -5+ -4+ -3+ -2+ -1+0+1+2+3+4=-11
c) -18+-17+-16+-15+-14+-13+-12+-11+-10+-9+-8+-7+-6+-5+-4+3+-2+-1+0+1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19=19
\(\frac{10^{18}}{2^{18}}=\frac{\left(2.5\right)^{18}}{2^{18}}=\frac{2^{18}.5^{18}}{2^{18}}=5^{18}\)
vậy 5x.5x+1.5x+2=5x+(x+1)+(x+2)<518=>x+(x+1)+(x+2) <18
vậy 3x+3<18 thì3x<15 =>x<5
x <5 vay65 x thuộc 1;2;3;4
vậy x=1;2;3;4
X=1;2;3;4