题目内容
先化简:,再任选一个你喜欢的数代入求值.
解:
······················· (1分)
··························· (2分)
································ (3分)
取和2以外的任何数,计算正确都可给分.(5分)
利用完全平方公式和平方差进行约分,然后通分化简,取数时,取和2以外的任何数
······················· (1分)
··························· (2分)
································ (3分)
取和2以外的任何数,计算正确都可给分.(5分)
利用完全平方公式和平方差进行约分,然后通分化简,取数时,取和2以外的任何数
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