计算1.3/4x²-1.5=0 2.(2x+3)²-(2x+3)-56=0 解关于x的方程:(1)x²-2(a-b)x-4ab=0(2)x²+3mx=54m²
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![计算1.3/4x²-1.5=0 2.(2x+3)²-(2x+3)-56=0 解关于x的方程:(1)x²-2(a-b)x-4ab=0(2)x²+3mx=54m²](/uploads/image/z/9341-53-1.jpg?t=%E8%AE%A1%E7%AE%971.3%2F4x%26%23178%3B-1.5%3D0+2.%EF%BC%882x%2B3%EF%BC%89%26%23178%3B-%EF%BC%882x%2B3%EF%BC%89-56%3D0+%E8%A7%A3%E5%85%B3%E4%BA%8Ex%E7%9A%84%E6%96%B9%E7%A8%8B%EF%BC%9A%EF%BC%881%EF%BC%89x%26%23178%3B-2%EF%BC%88a-b%EF%BC%89x-4ab%3D0%EF%BC%882%EF%BC%89x%26%23178%3B%2B3mx%3D54m%26%23178%3B)
计算1.3/4x²-1.5=0 2.(2x+3)²-(2x+3)-56=0 解关于x的方程:(1)x²-2(a-b)x-4ab=0(2)x²+3mx=54m²
计算1.3/4x²-1.5=0 2.(2x+3)²-(2x+3)-56=0 解关于x的方程:(1)x²-2(a-b)x-4ab=0(2)x²+3mx=54m²
计算1.3/4x²-1.5=0 2.(2x+3)²-(2x+3)-56=0 解关于x的方程:(1)x²-2(a-b)x-4ab=0(2)x²+3mx=54m²
3/4x²-1.5=0
3x²=6
x²=2
x=±√2
(2x+3)²-(2x+3)-56=0
(2x+3-8)(2x+3+7)=0
(2x-5)(2x+10)=0
2x-5=0 2x+10=0
∴X1=2.5
X2=-5
x²-2(a-b)x-4ab=0
(x-2a)(x+2b)=0
x-2a=0 x+2b=0
∴X1=2a
X2=-2b
x²+3mx=54m²
x²+3mx-54m²=0
(x+9m)(x-6m)=0
x+9m=0 x-6m=0
∴X1=-9m
X2=6m