解方程①(x+3)²-4=0 ②x²-4x-3=0 ③(x-3)+2x(x-3)=0
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解方程①(x+3)²-4=0 ②x²-4x-3=0 ③(x-3)+2x(x-3)=0
解方程①(x+3)²-4=0 ②x²-4x-3=0 ③(x-3)+2x(x-3)=0
解方程①(x+3)²-4=0 ②x²-4x-3=0 ③(x-3)+2x(x-3)=0
①(x+3)²=4 x+3=±2 x1=-1,x2=-5
②x=[4±√(4²-4×1×3)]/2 x1=3,x2=1
③(2x+1)(x-3)=0 2x+1=0 or x-3=0 x1=-1/2,x2=3
1. (x+3)²=4 x+3=±2 x1=-1,x2=-5 2. x=[4±√(4²-4×1×3)]/2 x1=3,x2=1 3. x= 2x+1=0 or x-3=0 x1=-1/2,x2=3