Question

用简便方法计算下列各题。

(2.5+2.5+2.5+2.5）*25*8=？ (4/9+5/13+5/9+8/13)*(1-91/100)=?
(6.9*0.125*1.75)/(2.3*1/8*1/4)=? [(1/4-1/4除以2）*8/13+1除以6又1/2]/0.01=?
请用简便方法计算，要有计算过程，越详细越好。谢谢！！！！

Answer 1

（2.5+2.5+2.5+2.5）*25*8
=2.5*4*25*8
=10*200
=2000

(4/9+5/13+5/9+8/13)*(1-91/100)
= (4/9+5/9+5/13+8/13)*9/100
=2*9/100
=9/50

(6.9*0.125*1.75)/(2.3*1/8*1/4)
=(2.3*3*1/8*1/4*7) /(2.3*1/8*1/4)
=2*7
=14

[(1/4-1/4除以2）*8/13+1除以6又1/2]/0.01
= [(1/4-1/8）*8/13+2/13]/0.01
=(1/8*8/13+2/13)*100
=3/13*100
=300/13

Answer 2

1.原式=（4×2.5）×25×8=100×20=2000.
2原式=（4/9+5/9+5/13+8/13)×（9/100)=2×(9/100)=9/50