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\(\frac{1.5.18+2.10.36+3.15.54}{1.3.9+2.6.18+3.9.27}=\frac{1.5.18.\left(1+2.2.2+3.3.3\right)}{1.3.9.\left(1+2.2.2+3.3.3\right)}\)
\(=\frac{1.5.18}{1.3.9}=\frac{10}{3}\)
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1: =>x/5=6/5
=>x=6
2: =>x^2=36
=>x=6 hoặc x=-6
3: =>x-5/2=3+1/6=19/6
=>x=19/6+5/2=19/6+15/6=34/6=17/3
4: =>x=1/2:2/5=1/2*5/2=5/4
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9(x + 1)² - 16(y + 3)²
= 9(x² + 2x + 1) - 16(y² + 6y + 9)
= 9x² + 18x + 9 - 16y² - 96y - 144
= 9x² - 16y² + 18x - 96y - 135
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32x + 3x + 3 = 759
3x.3x + 3x + 3 = 759
3x.3x + 3x = 759 - 3
3x.3x + 3x = 756
3x(3x + 1) = 756
3x(3x + 1) = 27.28
=> 3x = 27
3x = 33
=> x = 3
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bài2 \(x\times\dfrac{15}{16}-x\times\dfrac{4}{16}=2\)
\(x\times\dfrac{11}{16}=2\)
\(x=2:\dfrac{11}{16}\)
\(x=\dfrac{32}{11}\)
Bài 1 :
\(\dfrac{x}{16}\times\left(2017-1\right)=2\)
\(\dfrac{x}{16}\times2016=2\)
\(\dfrac{x}{16}=\dfrac{2}{2016}\)
\(x=\dfrac{2}{2016}\times16\)
\(x=\dfrac{1}{63}\)
Ta có :3x+1 -3x =18
=>3x *3-3x =18
=> 3x * (3-1) = 18
=>3x *2 = 18
=> 3x =9
=> 3x = 32
=> x=2
Vậy x=2
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