分解凑整
①145 1 × 1
11 12
②1995×199419941994-1994×199519951995
分析与解
① 145 1 × 1
11 12
= 144 12 × 1
11 12
= (144 + 12 )× 1
11 12
= 144× 1
12
= 12 1
11
+ 12 × 1
11 12
②1995×199419941994-1994×199519951995
=1995×1994×100010001-1994×1995×100010001
=0