4(x-3)²-(2x+1)²=(3x+1)(1-3x)+9x²RT.谢谢
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![4(x-3)²-(2x+1)²=(3x+1)(1-3x)+9x²RT.谢谢](/uploads/image/z/11730249-9-9.jpg?t=4%EF%BC%88x-3%EF%BC%89%26sup2%3B-%EF%BC%882x%2B1%EF%BC%89%26sup2%3B%3D%EF%BC%883x%2B1%EF%BC%89%EF%BC%881-3x%EF%BC%89%2B9x%26sup2%3BRT.%E8%B0%A2%E8%B0%A2)
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4(x-3)²-(2x+1)²=(3x+1)(1-3x)+9x²RT.谢谢
4(x-3)²-(2x+1)²=(3x+1)(1-3x)+9x²
RT.谢谢
4(x-3)²-(2x+1)²=(3x+1)(1-3x)+9x²RT.谢谢
4*(x-3)^2-(2x+1)^2=(3x+1)(1-3x)+9x^2
(2x-6)^2-(2x+1)^2=3x-9x^2+1-3x+9x^2
(2x-6+2x+1)(2x-6-2x-1)=1
(4x-5)*(-7)=1
-28x+35=1
28x=35-1
28x=34
x=17/14
4(x-3)²-(2x+1)²=(3x+1)(1-3x)+9x²
打开得4x²-24x+36-4x²-4x-2=0
28x=34
X=17/14