Question

tìm x,y biết

a) -2x (10x -3 ) + 5x (4x + 1) = 25

b)y (5 - 2y) + 2y (y - 1) = 15

c) x (x + 1) - (x+ 1) = 35

Answer 1

a, \(-2x\left(10x-3\right)+5x\left(4x+1\right)=25\)

\(\Rightarrow-20x^2+6x+20x^2+5x=25\)

\(\Rightarrow11x=25\Rightarrow x=\dfrac{25}{11}\)

b, \(y\left(5-2y\right)+2y\left(y-1\right)=15\)

\(\Rightarrow5y-2y^2+2y^2-2y=15\)

\(\Rightarrow3y=15\Rightarrow y=5\)

c, \(x\left(x+1\right)-\left(x+1\right)=35\)

\(\Rightarrow\left(x+1\right).\left(x-1\right)=35\)

\(\Rightarrow x^2-1=35\Rightarrow x^2=36\Rightarrow x=\pm6\)

Chúc bạn học tốt!!!