一道数学题
(ax+by)"+(bx-ay)"
"代表平方
参考答案:(ax+by)"+(bx-ay)"
=a"x"+2axby+b"y"+b"x"-2axby+a"y"
=a"x"+b"y"+b"x"+a"y"
=a"〔x"+y"〕+b"〔x"+y"〕
=〔x"+y"〕〔a"+b"〕
(ax+by)"+(bx-ay)"
"代表平方
参考答案:(ax+by)"+(bx-ay)"
=a"x"+2axby+b"y"+b"x"-2axby+a"y"
=a"x"+b"y"+b"x"+a"y"
=a"〔x"+y"〕+b"〔x"+y"〕
=〔x"+y"〕〔a"+b"〕