能简算的要简算 (1)4/(75%+50%-1) (2)4.75*37.5%+8分之3*5.25 (3)5分之4×20%+5分之4
问题描述:
能简算的要简算 (1)4/(75%+50%-1) (2)4.75*37.5%+8分之3*5.25 (3)5分之4×20%+5分之4
答
(1)4/(75%+50%-1)
=4÷25%
=16
(2)4.75*37.5%+8分之3*5.25
=4.75x3/8+5.25x3/8
=(4.75+5.25)x3/8
=10x3/8
=15/4
(3)5分之4×20%+5分之4
=4/5x(1+20%)
=4/5x6/5
=24/25第二题37.5%没算得数最后是123/32算了 37.5%=3/8哦,第三题为什么要1+20%5分之4×20%+5分之4 =4/5x20%+4/5x1=4/5x(1+20%)=4/5x6/5=24/25