题目内容：

2*28+8*28= 99*39+39= 25*32*125= 要简便算

优质解答

2*28+8*28
=（2+8）*28
=10*28
=280
99*39+39
=（99+1）*39
=100*39
=3900
25*32*125
=25*4*8*125
=100*1000
=100000