初三
数学，急急急急
x^2 -10x - 4 = 0==>扰圆 x^2 -10x = 4==> x^2 - 10x + 25 = 4 +25==> (x - 5)^2 = 29==> |x -5| = √29==> x = 5 ±√29 x^2 + 5x - 3= 0==> x^2 + 5x = 3==> x^2 + 5x + 25/4 = 3 +25/4==>碧脊 (x +5/2)^2 = 37/4==> |x +5/2| = (√37) / 2==>缓慧塌 x = -5/2 ± (√37) / 2==> x = (-5±√37)/2
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