分解因式下:X4-2X2-8 X2-3XY+2Y2 2X2-7X+3 X2+2X-15-AX-5A 解方程:1999X2
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分解因式下:X4-2X2-8 X2-3XY+2Y2 2X2-7X+3 X2+2X-15-AX-5A 解方程:1999X2-2000X+1=0 X2-14X+13=0
1949X2-1999X+50=0
1949X2-1999X+50=0
分解因式下:
X4-2X2-8
=(x²-4)(x²+2)
=(x+2)(x-2)(x²+2)
X2-3XY+2Y2
=(x-2y)(x-y)
2X2-7X+3
=(2x-1)(x-3)
X2+2X-15-AX-5A
=(x+5)(x-3)-A(x+5)
=(x+5)(x-3-A)
解方程:1999X2-2000X+1=0
(1999x-1)(x-1)=0
x=1/1999 x=1
X2-14X+13=0
(x-13)(x-1)=0
x=13 x=1
1949X2-1999X+50=0
(1949x-50)(x-1)=0
x=50/1949 x=1
X4-2X2-8
=(x²-4)(x²+2)
=(x+2)(x-2)(x²+2)
X2-3XY+2Y2
=(x-2y)(x-y)
2X2-7X+3
=(2x-1)(x-3)
X2+2X-15-AX-5A
=(x+5)(x-3)-A(x+5)
=(x+5)(x-3-A)
解方程:1999X2-2000X+1=0
(1999x-1)(x-1)=0
x=1/1999 x=1
X2-14X+13=0
(x-13)(x-1)=0
x=13 x=1
1949X2-1999X+50=0
(1949x-50)(x-1)=0
x=50/1949 x=1
分解因式下:X4-2X2-8 X2-3XY+2Y2 2X2-7X+3 X2+2X-15-AX-5A 解方程:1999X2
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