【★每日一题★7月25日】08初三中考竞赛题天天练—竞赛辅导

风吹麦浪

风吹麦浪

明天公布答案

james111

=a2b2+2ab+1-(a2-2ab-b2)=(ab+1)2-(a-b)2=(ab+a-b+1)(ab-a+b+1)

月夜之风

a2b2-a2+4ab-b2+1
=a2b2-(a-b)2+2ab+1
=(ab+1)2-(a-b)2
=(ab+1+a-b)(ab+1-a+b)

理想的翅膀

原式=a2b2+2ab+1-(a2-2ab+b2)
       =(ab+1)2-(a-b)2
       =(ab+a-b+1)(ab-a+b+1)

渊梦轩

原式=(a2b2+2ab+1)-(a2+2ab+b2)
        =(ab+1)2-(a+b)2
        =(ab+1+a+b)(ab+1-a-b)

alfonsoxx

a2b2-a2+4ab-b2+1
=a2b2-a2+2ab-b2+2ab
=a2b2-(a2-2ab+b2)+1+2ab
=a2b2+2ab+1-(a-b)2
=(ab)2+2ab+1-(a-b)2
=(ab+1)2-(a-b)2
=(ab+1-a+b)(ab+1+a-b)

daguailangma

=(a2b2+2ab+1)-(a2-2ab+b2)
=(ab+1)2-(a-b)2
=(ab+a-b+1)(ab-a+b+1)

kaoshengwang

哈哈!so easy!
=(ab+1+a-b)(ab+1-a+b)

潇湘_箜房裥

原式=a2b2-(a2-2ab+b2)+2ab-b2+1
       =a2b2+2ab+1-(a-b)2
       =(ab+1)2-(a-b)2
       =(ab+1-a-b)(ab+1+a-b)