我唔明,例如
x²+3x+2=0
x²+3x=-2
x²+3x+(3/2)²=-2+(3/2)²
(點解要加2分3既2次? 係唔係分a,b同c?b個個數1定要除2?)
只係呢度唔識 .同埋配方法有冇公武ga?
收錄日期: 2021-04-13 16:27:49
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