若(三分之二)1-2x平方=(二分之三)x+3平方之值為何?

2016-06-20 11:31 am

回答 (3)

2016-06-20 1:07 pm
Sol
(2/3)*(1-2x)^2=(3/2)*(x+3)^2
6*(2/3)*(1-2x)^2=6*(3/2)*(x+3)^2
4(1-2x)^2=9(x+3)^2
9(x+3)^2-4(2x-1)^2=0
[3(x+3)-2(2x-1)]*[3(x+3)+2(2x-1)]=0
(3x+9-4x+2)(3x+9+4x-2)=0
(-x+11)(7x+7)=0
x=11 or x=-1
2016-07-03 3:44 pm
因2/3與3/2為倒數 故指數為相反數
1-2X=-X-3
X=4
2016-06-27 4:35 am
(2/3)(1-2x)^2=(3/2)(x+3)^2
4(1-4x+4x^2)=9(x^2+6x+9)
4-16x+16x^2=9x^2+54x+81
7x^2 -70x-77=0
x^2 -10x-11=0
x=11 或 x=1


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