解方程 7x^2+2x=0 x^2=(2x-5)^2 49x^2-25=0 4x^2=8x 今天就要
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![解方程 7x^2+2x=0 x^2=(2x-5)^2 49x^2-25=0 4x^2=8x 今天就要](/uploads/image/z/317348-44-8.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B+7x%5E2%2B2x%3D0+x%5E2%3D%282x-5%29%5E2+49x%5E2-25%3D0+4x%5E2%3D8x+%E4%BB%8A%E5%A4%A9%E5%B0%B1%E8%A6%81)
解方程 7x^2+2x=0 x^2=(2x-5)^2 49x^2-25=0 4x^2=8x 今天就要
解方程 7x^2+2x=0 x^2=(2x-5)^2 49x^2-25=0 4x^2=8x 今天就要
解方程 7x^2+2x=0 x^2=(2x-5)^2 49x^2-25=0 4x^2=8x 今天就要
7x^2+2x=0 => x(7x+2)=0 =>x1=0, x2=-2/7
x^2=(2x-5)^2 =>2x-5=+/- x =>x1=5, x2=5/3
49x^2-25=0 =>x^2=25/49 =>x1=5/7, x2=-5/7
4x^2=8x =>4x(x-2)=0 =>x1=0, x2=2
怎么样?够详细吧?哈哈