1-x+x^2/4(a-2b)^2-14(a-2b)+49

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1-x+x^2/4(a-2b)^2-14(a-2b)+491-x+x^2/4(a-2b)^2-14(a-2b)+491-x+x^2/4(a-2b)^2-14(a-2b)+49看下面截图1-x+x^2/

1-x+x^2/4(a-2b)^2-14(a-2b)+49
1-x+x^2/4
(a-2b)^2-14(a-2b)+49

1-x+x^2/4(a-2b)^2-14(a-2b)+49
看下面截图

1-x+x^2/4
=1²-2×1×½x+(½x﹚²
=(1-½x﹚²
(a-2b)^2-14(a-2b)+49
=[(a-2b)-7]²
=(a-2b-7)²

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