ta có:\(\dfrac{-1,64}{8,51}=\dfrac{x}{-3,11}\)
<=>\(x=\dfrac{-1,64.\left(-3,11\right)}{8,51}=0,5993419506\)
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a)\(\dfrac{x+1}{2}\)=\(\dfrac{2x+3}{5}\)
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Bài 1:Thực hiện phép tính.
1) dfrac{2cdot6^9-2^5cdot18^4}{2^2cdot6^8} ; 2)dfrac{15^3+5cdot15^2-5^3}{18^2+6cdot18^2-6^3}
Bài 2:Tìm x, biết:
1)^{left(5x+1right)^2}dfrac{36}{49} ; 2) 2^{x-1}16 ; 3)left(-dfrac{3}{4}right)^{3x-1}-dfrac{27}{64} ; 4)dfrac{-1}{2}+dfrac{5}{x+3}dfrac{-5}{6}
5)dfrac{37-x}{x+13}dfrac{3}{7} ; 6)dfrac{1}{12}:dfrac{4}{21}3dfrac{1}{2}:left(3x-2right) ; 7) ^{2^{2x+1}+4^{x+3}264} ; 8) dfrac{x+7}{-20}dfrac{-5}{x+7}
9) dfrac{...
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Bài 1:Thực hiện phép tính.
1) \(\dfrac{2\cdot6^9-2^5\cdot18^4}{2^2\cdot6^8}\) ; 2)\(\dfrac{15^3+5\cdot15^2-5^3}{18^2+6\cdot18^2-6^3}\)
Bài 2:Tìm x, biết:
1)\(^{\left(5x+1\right)^2}\)=\(\dfrac{36}{49}\) ; 2) \(2^{x-1}=16\) ; 3)\(\left(-\dfrac{3}{4}\right)^{3x-1}=-\dfrac{27}{64}\) ; 4)\(\dfrac{-1}{2}+\dfrac{5}{x+3}=\dfrac{-5}{6}\)
5)\(\dfrac{37-x}{x+13}=\dfrac{3}{7}\) ; 6)\(\dfrac{1}{12}:\dfrac{4}{21}=3\dfrac{1}{2}:\left(3x-2\right)\) ; 7) \(^{2^{2x+1}+4^{x+3}=264}\) ; 8) \(\dfrac{x+7}{-20}=\dfrac{-5}{x+7}\)
9) \(\dfrac{x}{8}=\dfrac{x}{x^3}\) ; 10) \(\dfrac{x-1}{x+5}=\dfrac{6}{7}\)
Mọi người giúp mình với,làm ơn !!!!!
Tìm x,y,z:
a/\(\dfrac{5x-8y}{3}\)=\(\dfrac{2y-5z}{7}\)=\(\dfrac{4z-x}{5}\) và x+y+z=45
b/\(\dfrac{x-1}{2}\)=\(\dfrac{y-2}{3}\)=\(\dfrac{z-3}{4}\)và x-2y+3z=14
\(\dfrac{1}{x}=\dfrac{1}{6}+\dfrac{y}{3}\)(x,y nguyên dương)
Tìm x:
\(\dfrac{4}{x-3}=\dfrac{8}{y-6}=\dfrac{20}{z-15}\) và xyz= 640
Help me!!!
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a) \(\dfrac{11}{13}-\left(\dfrac{5}{42}-x\right)=\left(\dfrac{15}{28}-\dfrac{11}{13}\right)\)
b) \(\left(\dfrac{7}{2}-2x\right)x3\dfrac{2}{5}+1\dfrac{4}{5}=7\dfrac{6}{5}\)
c) \(\left|2x-\dfrac{1}{3}\right|=\dfrac{5}{3}-2\)
d) (2x-1)3= -27
e) \(\dfrac{16}{2x}=1\)
Tìm x,y,z biết
a)
\(\dfrac{x}{2}=\dfrac{y}{3};\dfrac{y}{4}=\dfrac{z}{5}\) và \(x^2-y^2=-16\)
b)
2x=3y=5z và x+y-z=95