用恰当方法解方程(1)4x²-169=0 (2)x²-8x+16 (3)2(x+3)²=8 (4)x²+2x=899=0
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用恰当方法解方程(1)4x²-169=0 (2)x²-8x+16 (3)2(x+3)²=8 (4)x²+2x=899=0
用恰当方法解方程(1)4x²-169=0 (2)x²-8x+16 (3)2(x+3)²=8 (4)x²+2x=899=0
用恰当方法解方程(1)4x²-169=0 (2)x²-8x+16 (3)2(x+3)²=8 (4)x²+2x=899=0
(1)4x²-169=0
(2x+13)(2x-13)=0
x1=-13/2 x2=13/2
(2)x²-8x+16=0
(x-4)²=0
x=4
(3)2(x+3)²=8
(x+3)²-4=0
(x+3+2)(x+3-2)=0
(x+5)(x+1)=0
x1=-5 x2=-1
(4)x²+2x-899=0
(x+31)(x-29)=0
x1=-31 x2=29