㈠ 閫夊彇A鍨嬪浘鐗囦笁鍧,B鍨嬪浘鐗1鍧,C鍨嬪浘鐗囪嫢騫插潡,鎷間竴涓姝ｆ柟褰
a錛2,b錛3
3a²+kab+b²錛濓箼3a+b錒氾箼a+b錒k錛4
濡傚浘錛3a²+4ab+b²A3鍧椼侭涓鍧楋紝C4鍧椼傛嫾鎴愮煩褰5脳9
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