y=1/2x²-6x+21转化成/12(x-6)²+3的详细过程?
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y=1/2x²-6x+21转化成/12(x-6)²+3的详细过程?
y=1/2x²-6x+21转化成/12(x-6)²+3的详细过程?
y=1/2x²-6x+21转化成/12(x-6)²+3的详细过程?
y=1/2*x²-6x+21=1/2*(x²-12x)+21
=1/2*(x²-2*6*x+6²-6²)+21
=1/2*[(x-6)²-36)+21
=1/2*(x-6)²-18+21
=1/2*(x-6)²+3
配方法
y=1/2x^2-6x+21
=1/2(x^2-12x+36)+3
=1/2(x-6)^2+3
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y=1/2x²-6x+21
=1\2(x²-12X)+21
=1\2(x²-12+36-36)+21
=1\2(X-6)²-18+21
=1\2(X-6)²+3