---急急急---简便计算 (1)0.75*0.25*3.2 (2) 4.8/0.5/0.2 (3) (5.4+3.6)*6.5+6.5
问题描述:
---急急急---简便计算 (1)0.75*0.25*3.2 (2) 4.8/0.5/0.2 (3) (5.4+3.6)*6.5+6.5
最好今晚解决!
(1)0.75*0.25*3.2 (2) 4.8/0.5/0.2 (3) (5.4+3.6)*6.5+6.5
答
(1)
0.75*0.25*3.2
=3/4*1/4*16/5
=3/16*16/5
=3/5
(2)
4.8/0.5/0.2
=4.8×2/0.2
=4.8×(2/0.2)
=4.8*10
=48
(3)
(5.4+3.6)*6.5+6.5
=9*6.5+6.5
=6.5*(9+1)
=6.5*10
=65