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> 在实数范围内分解因式a2-12=▲.-九年级数学
在实数范围内分解因式a2-12=▲.-九年级数学
题目简介
在实数范围内分解因式a2-12=▲.-九年级数学
题目详情
在实数范围内分解因式
a
2
-12=
▲
.
题型:填空题
难度:中档
来源:不详
答案
直接利用平方差公式分解因式.平方差公式:a2-b2=(a+b)(a-b).
解:a2-12=a2-(2
)2=(a+2
)(a-2
);
故答案为:
点评:本题考查平方差公式分解因式,把12写成(2
)2是利用平方差公式的关键
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题目简介
在实数范围内分解因式a2-12=▲.-九年级数学
题目详情
答案
解:a2-12=a2-(2
故答案为:
点评:本题考查平方差公式分解因式,把12写成(2