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\(2.3^{x+1}=10.3^{12}+8.3^{12}\\ VP=\left(10+8\right).3^{12}=18.3^{12}=2.3^2.3^{12}\\ =2.3^{2+12}=2.3^{14}\\ VT=VP\\ \Rightarrow2.3^{x+1}=2.3^{14}\\ \Rightarrow x+1=14\\ Vậy:x=14-1=13\)
\(2\cdot3^{x+1}=10\cdot3^{12}+8\cdot3^{12}\\\Rightarrow 2\cdot3^{x+1}=3^{12}\cdot(10+8)\\\Rightarrow 2\cdot3^{x+1}=3^{12}\cdot18\\\Rightarrow 2\cdot3^{x+1}=3^{12}\cdot3^2\cdot2\\\Rightarrow 3^{x+1}=3^{12}\cdot3^2\\\Rightarrow 3^{x+1}=3^{14}\\\Rightarrow x+1=14\\\Rightarrow x=14-1\\\Rightarrow x=13\\Vậy:x=13\)
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\(2.3^x=10.3^{12}+8.27^4\)
\(2.3^x=10.3^{12}+8.\left(3^3\right)^4\)
\(2.3^x=18.3^{12}\)
\(3^x=9.3^{12}=3^{14}\)
\(x=14\)
2.3ˣ = 10.3¹² + 8.27⁴
2.3ˣ = 10.3¹² + 8.(3³)⁴
2.3ˣ = 10.3¹² + 8.3¹²
2.3ˣ = 3¹².(10 + 8)
2.3ˣ = 3¹².18
3ˣ = 3¹².18 : 2
3ˣ = 3¹² . 9
3ˣ = 3¹² . 3²
3ˣ = 3¹⁴
x = 14
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a)|x|<8
=>|x| E {0;1;2;3;4;5;;6;7}
=>x E {0;-1;1-2;2;-3;3;-4;4;-5;5;-6;6;-7;7}
b)2009+[312+(-2009)+(-312)]
=2009+312+(-2009)+(-312)
=[2009+(-2009)]+[312+(-312)]=0+0=0
tick đi
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=312.(-18)-312.81-312.1
=312.[(-18)-81-1]
=312.(-100)
=-31200
312.(-18)+(-312).81-312
=312.(-18)+312.(-81)-312
=312.[(-18)+(-81)-1]
=312.[(-99)-1]
=312.(-100)
=-31200
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a: =371-271-531+731=100+200=300
b: =-321-28-327+27
=-350-300
=650
c: =-424-371+424+29=-342
d: =-249+248=-1
a)371+(-271)+(-531)+731=300
b)-312+(-327+(-28)+27=650
c)-424+(-371)-(-424)-(-29)=-342
d)-249+197+248+(-197)=-1
e)3+(-5)+(-9)+11+(-13)=-13
g)-8+10+(-12)+14+(-16)+18=6