
2个回答
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(1)原式为2(x+3)²=x(x+3)
2(x²+6x+9)=x²+3x
2x²-x²+12x-3x+18=0
x²+9x+18=0
(x+6)(x+3)=0
x1=-6 x2=-3
(2)原式为x²-2√5+2=0
x²-2√5+5-3=0
(x-√5)²=3
x-√5=正负3
x1=3+√5 x2=√5-3
(3)原式为(x+1)²-3(x+1)+2=0
(x+1-2)(x+1-1)=0
(x-1)x=0
x1=1 x2=0
2(x²+6x+9)=x²+3x
2x²-x²+12x-3x+18=0
x²+9x+18=0
(x+6)(x+3)=0
x1=-6 x2=-3
(2)原式为x²-2√5+2=0
x²-2√5+5-3=0
(x-√5)²=3
x-√5=正负3
x1=3+√5 x2=√5-3
(3)原式为(x+1)²-3(x+1)+2=0
(x+1-2)(x+1-1)=0
(x-1)x=0
x1=1 x2=0
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