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請幫下我 急!要步驟1.... 顯示更多 請幫下我 急! 要步驟 1. 4x^2-4x+1=0 2.5x^2+4x-1=0 3.6x^2+4(x+2)=9 4.-2x^2+3(4x-1)=5 5.x^2=3(x+6) 6.x^2=4(2x-1) 7.6+4x-x^2=0 8.x+3x^2=1 9.2x^2+x=7 10.4x^2-49=0 11.x^2-11x+28=0 12.x^2+18x+72=0 13.x^2-22x+121=0 14.3x^2-10x+8=0 15.6x^2+5x-4=0 16.12^2+35x+8=0 17.49x^2-42x+9=0 18.98x^2-288=0 19.27x^2-126x=0 20.144-100x^2=0 21.6-13x+2x^2=0

最佳解答:

1. 4x2-4x+1=0 (2x-1) 2=0 2x-1=0x=1/2 2.5x2+4x-1=0 x=1/2 or x=-1 3.6x2+4(x+2)=9 6x2+4x+8=96x2+4x-1=0x=0.194 or x=-0.860 4.-2x2+3(4x-1)=5 -2x2+12x-3=5-2x2+12x-8=0x=0.764 or x=5.236 5.x2=3(x+6) x2=3x+18x2-3x-18=0x=6 or x=-3 6.x2=4(2x-1) x2=8x-4x2-8x+4=0 x=7.464 or x=0.536 7.6+4x-x2=0 x=-1.162 or x=5.162 8.x+3x2=13x2+x-1=0 x=0.434 or x=-0.768 9.2x2+x=7 2x2+x-7=0x=1.637 or x=-2.137 10.4x2-49=0 x2=49/4 x=-7/2 or x=7/2 11.x2-11x+28=0 x=7 or x=4 12.x2+18x+72=0 x=-6 or x=-12 13.x2-22x+121=0 x=11 14.3x2-10x+8=0 x=2 or x=4/3 15.6x2+5x-4=0 x=1/2 or x=-4/3 16.122+35x+8=0x=-1/4 or x=-8/3 17.49x2-42x+9=0 x=3/7 18.98x2-288=0 x2=144/49x=12/7 or x=-12/7 19.27x2-126x=0 x=14/3 or x=0 20.144-100x2=0 x=-6/5 or x=6/5 21.6-13x+2x2=0x=6 or x=1/2

其他解答:

VIc兄is just using calculator in some questions I think we shoulad use the formula x=(-(b)±√(b^2-4ac))/(2a)D1B39E804036C6BD