解方程:(1)x^2+1=2x.
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/23 01:16:04
解方程:(1)x^2+1=2x.
(2)在因式分解x^2+ax+b时,小明看错了b,分解结果是(x+2)(x+4).小红看错了a,分解结果是(x+1)(x+9),求a,b的值,并写出正确的分解过程.
(3)x^2+x+1/4=0.
(4)(x^2-14x+49)/(x^2-49).
(5)已知x+y=1,xy=-1/2,利用因式分解求x(x+y)(x-y)-x(x+y)^2的值.
(2)在因式分解x^2+ax+b时,小明看错了b,分解结果是(x+2)(x+4).小红看错了a,分解结果是(x+1)(x+9),求a,b的值,并写出正确的分解过程.
(3)x^2+x+1/4=0.
(4)(x^2-14x+49)/(x^2-49).
(5)已知x+y=1,xy=-1/2,利用因式分解求x(x+y)(x-y)-x(x+y)^2的值.
(1)x²+1=2x
(x-1)²=0
x=1
(2)(x+2)(x+4)=x²+6x+8
则a=6
(x+1)(x+9)=x²+10x+9
则b=9
x²+6x+9=(x+3)²
(3)x²+x+1/4=0
(x+1/2)²=0
x=-1/2
(4)(x²-14x+49)/(x²-49)=(x-7)²/(x+7)(x-7)
=(x-7)/(x+7)
(5)x(x+y)(x-y)-x(x+y)²=x(x+y)(x-y-x-y)
=-2xy(x+y)
=-2*(-1/2)=1
(x-1)²=0
x=1
(2)(x+2)(x+4)=x²+6x+8
则a=6
(x+1)(x+9)=x²+10x+9
则b=9
x²+6x+9=(x+3)²
(3)x²+x+1/4=0
(x+1/2)²=0
x=-1/2
(4)(x²-14x+49)/(x²-49)=(x-7)²/(x+7)(x-7)
=(x-7)/(x+7)
(5)x(x+y)(x-y)-x(x+y)²=x(x+y)(x-y-x-y)
=-2xy(x+y)
=-2*(-1/2)=1
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