(1)7x²=21,(2)(x-5)²求x的值(3)x²=49(4)(x-1)²=25
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![(1)7x²=21,(2)(x-5)²求x的值(3)x²=49(4)(x-1)²=25](/uploads/image/z/1248133-13-3.jpg?t=%EF%BC%881%EF%BC%897x%26%23178%3B%3D21%2C%EF%BC%882%EF%BC%89%EF%BC%88x-5%EF%BC%89%26%23178%3B%E6%B1%82x%E7%9A%84%E5%80%BC%EF%BC%883%EF%BC%89x%26%23178%3B%3D49%EF%BC%884%EF%BC%89%EF%BC%88x-1%EF%BC%89%26%23178%3B%3D25)
(1)7x²=21,(2)(x-5)²求x的值(3)x²=49(4)(x-1)²=25
(1)7x²=21,(2)(x-5)²求x的值
(3)x²=49(4)(x-1)²=25
(1)7x²=21,(2)(x-5)²求x的值(3)x²=49(4)(x-1)²=25
(1)7x²=21,
x^2=3 x=v3或者-v3
(2)(x-5)²=0求x的值
x=5
(3)x²=49
x=7或者-7
(4)(x-1)²=25
x-1=5或者x-1=-5
x=6或者x=-4