2x^2-3x+1=02x^2-4x+6=0(x+3)=(2x-1)^23(x+2)^2=x^2-43(x-2)^2=2x^2-4x(x+3)(x-4)=30
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2x^2-3x+1=02x^2-4x+6=0(x+3)=(2x-1)^23(x+2)^2=x^2-43(x-2)^2=2x^2-4x(x+3)(x-4)=30
2x^2-3x+1=0
2x^2-4x+6=0
(x+3)=(2x-1)^2
3(x+2)^2=x^2-4
3(x-2)^2=2x^2-4x
(x+3)(x-4)=30
2x^2-3x+1=02x^2-4x+6=0(x+3)=(2x-1)^23(x+2)^2=x^2-43(x-2)^2=2x^2-4x(x+3)(x-4)=30
(2x-1)(x-1)=0
x1=1/2,x2=1
2(x-1)(x-2)=0
x1=1,x2=2
4x^2-5x-2=0
不能用因式分解
2x^2+12x+16=0
2(x+2)(x+4)=0
x1=-2,x2=-4
x^2-8x+12=0
(x-2)(x-6)=0
x1=2,x2=6
x^2-x-42=0
(x+6)(x-7)=0
x1=-6,x2=7
*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X ||
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