4(x减1)的平方等于25
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(2x减1)的平方等于x的平方加4x加4(2x-1)^2=x^2+4x+44x^2-4x+1=x^2+4x+43x^2-8x-3=0(3x+1)(x-3)=03x+1=0x1=-1/3x-3=0x2=
无解.因为X-1的平方底数不能为零
解(x+3)²=(1-3x)²∴x+3=1-3x或x+3=-(1-3x)4x=-2或2x=4∴x=-1/2或x=2
121x²=25x²=25/121=(±5/11)²所以x=-5/11,x=5/11
x²+x-²=14
X的平方减4X加1等于0x²+1=4x两边同时除以x,得x+1/x=4则(x+1/x)²=4²x²+2+1/x²=16所以x²+1/x
(x-3)²=4(2x+1)²x-3=2(2x+1)或x-3=-2(2x+1)x=-5/3或x=1/5
x^2+1/x^2=4x^2-2+1/x^2=4-2x^2-2*x*1/x+1/x^2=2(x-1/x)^2=2x-1/x=根号2或-根号2
(x-3)²+4x(x-3)=0(x-3)[(x-3)+4x]=0(x-3)(5x-3)=0x1=3,x2=3/59(x-2)²=4(x+1)²3(x-2)=2(x+1)
x+y=4,(x+y)^2=16,x^2+y^2=10,2xy=6所以xy=3可以解得x=1,y=3或x=3,y=1所以x-y=-2或2综上(1)3;(2)-2或2
x²-4x-1=0x²-4x=1所以:(2x-3)²-(x+y)(x-y)-y²=4x²-12x+9-(x²-y²)-y²
2x^2-4x=12x^2-4x-1=02(x^2-2x+1)-3=0(x-1)^2=3/2x=√3/2+1
(x-2)²-4(x+1)²=0平方差公式:[(x-2)+2(x+1)][(x-2)-2(x+1)]=03x(-x-4)=0x(x+4)=0x=0或x=-4
x²-4x=1x²-4x+4-4=1(x-2)²=4+1(x-2)²=5x-2=±√5x=±√5+2再问:虾米?写下来?谢谢再答:这个很简单,