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2024-11-12 16:00:27
a, \(\dfrac{2+1}{2^2-9}=\dfrac{2+1}{2^2-3}=-\dfrac{3}{5}\)
b, \(\dfrac{2x^2-1}{x^2-x}-\dfrac{x-1}{x}+\dfrac{3}{x+1}\)\(=\dfrac{2x^2+x}{x\left(x+1\right)}-\dfrac{x-1}{x\left(x+1\right)}+\dfrac{3}{x\left(x+1\right)}\)\(=\dfrac{\left(2x^2-1\right)-\left(x-1\right)+3}{x\left(x+1\right)}\)
= \(\dfrac{2x^2-1-x-1+3}{x\left(x+1\right)}\)= \(\dfrac{x+3}{x\left(x+1\right)}\) = \(\dfrac{3}{x+1}\)
c, \(M=\dfrac{3}{x+1}.-\dfrac{3}{5}=-\dfrac{9}{5x+5}\)
2024-11-11 16:52:20
a, \(5\left(x+2y\right)-15x\left(x+2y\right)\) = \(\left(5-15x\right)\left(x+2y\right)\)
b, \(4x^2-12+9\) = \(2x^2-2.2.3+3^2\) = \(\left(2x+3\right)^2\)
2024-11-05 16:34:59
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