(x-1)^2=4(x-3)^2
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(x-1)^2=4(x-3)^2
(x-1)^2=4(x-3)^2
(x-1)^2=4(x-3)^2
解 :分解因式
x^2-2x+1=4(x^2-6x+9)
x^2-2x+1=4x^2-24x+36
移项:0=3x^2-22x+35
3 -7 (草稿纸上列十字相乘)
1 -5
(3x-7)(x-5)=0
解得:x1=7/3 x2=5
解九宫格题目(X为未知数)9 X 2 X 7 X 8 X XX X 4 X X 9 X 6 X1 3 X 5 X X X X 24 X X 8 5 X X 1 XX 8 9 4 X 1 6 7 XX 1 X X 3 6 X X 88 X X X X 2 X 3 6X 5 X 6 X X 9 X XX X 7 X 4 X 2 X 1
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