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1、解一元二次方程专项练习李老师配方法解一元二次方程1、 x2-2x=5 x2-2x=2x+1 x2+4x-2=0 x2-4x-1=02x2-1=4x x(x+8)=16 x2-6x-6=0 x2-6x+1=0x2+4x+2=0 6x2-x-12=0 x2-6x-2=0 2x2+1=3x x2+2x-2=0 x2+4x-1=0 2x2-x-1=0 4x2+8x+1=0x2-4x+1=0 6x2-x-12=0 x2+6x+7=0 x2-8x+5=02x2-4x-1=0 2x2-4x-1=0 x2+2x-2=0 x2-6x-3=02x2-4x+1=0 x2-4x+1=0 x2-4x+2=0 2x2-8
2、x+3=03x2-6x-1=0 2x2+4x-1=0 x2+2x-4=0 x2+2x-7=0x2-2x=1 x2-4x+3=0 x2-2x-2=0 x2+4x=3x2-4x-1=0 x2-7x+10=0 2x2-5x-1=0 2x2-3x+1=02x2+3x-1=0 x2-4x+1=0 x2+2x-1=0 x2+4x+1=0直接开平方解一元二次方程1、 (2x+3)2-25=0 (x-1)2=4 64(1+x)2=100(x+1)2=9 16(x-2)2=64 (x-1)2=425x2-49=0 (2x-1)2=9 (x+2)2-25=0 7(m+1)2-14=0 8(x+1)2=128 (2
3、x-1)2-16=0(2x-1)2=9 x2-16=0 9x2-16=0 3(2x-1)2-27=0 (y+2)2=9 (x-2)2-4=0 (x+2)2-25=0因式分解法解一元二次方程 (x-3)2+2x(x-3)=0 3x(x+2)=5(x+2)(x-3)2+4x(x-3)=0 2(x-3)=3x(x-3)3(x-2)2=x(x-2) 3(x-3)2+x(x-3)=03(x-5)2=2(5-x) (x-3)2=2(3-x)x(x-3)-4(3-x)=0 (x-3)2+2x(x-3)=0 (x-1)2-2(x-1)=0 3x(x-2)-2(x-2)=0(3x-2)2=(x+4)2 (3x-1)2=(x+1)2 (x-2)2=(2x+3)2 1