问题
计算题
a2﹣b2+x2﹣y2﹣2(ax﹣by)
答案
解:原式=a2﹣b2+x2﹣y2﹣2ax+2by
=(a2+x2﹣2ax)﹣(b2+y2﹣2by)
=(a﹣x)2﹣(b﹣y)2
=(a+b﹣x﹣y)(a﹣b﹣x+y)
a2﹣b2+x2﹣y2﹣2(ax﹣by)
解:原式=a2﹣b2+x2﹣y2﹣2ax+2by
=(a2+x2﹣2ax)﹣(b2+y2﹣2by)
=(a﹣x)2﹣(b﹣y)2
=(a+b﹣x﹣y)(a﹣b﹣x+y)