(1)x²-2 (2)2x²-7x-4(3)x²+x-2(4)2x²-3x+1 用十字相乘法解方程(1)(x-2)²
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(1)x²-2 (2)2x²-7x-4(3)x²+x-2(4)2x²-3x+1 用十字相乘法解方程(1)(x-2)²
(1)x²-2 (2)2x²-7x-4(3)x²+x-2(4)2x²-3x+1 用十字相乘法解方程
(1)(x-2)²
(1)x²-2 (2)2x²-7x-4(3)x²+x-2(4)2x²-3x+1 用十字相乘法解方程(1)(x-2)²
(1)x²-2
=(x-√2)(x+√2)
(x-2)^2=x^2-4x+4
(2)2x²-7x-4
=(2x+1)(x-4)
(3)x²+x-2
=(x+2)(x-1)
(4)2x²-3x+1
=(2x-1)(x-1)
(1)(x-根号2)(x+根号2)
(2)(2x-4)(x+1)
(3) (x+2)(x-1)
(4) (2x-1)(x-1)
(1)x²-2
=(x-v2)(x+v2);【v为根号】
(2)2x²-7x-4
=(x-4)(2x+1);
(3)x²+x-2
=(x-1)(x+2);
(4)2x²-3x+1
=(x-1)(x-2).
(1)x²-2
=(x-√2)(x+√2)
(x-2)^2=x^2-4x+4
(x-2)^2=x^2-4x+4
(2)2x²-7x-4
=(2x+1)(x-4)
(3)x²+x-2
=(x+2)(x-1)
(4)2x²-3x+1
=(2x-1)(x-1)
(x-2)^2=x^2-4x+4