{2分之1+8分之1}乘75% 10除以9分之5+4乘12.5% 4分之1除以{1-2分之1-25%}

问题描述:

{2分之1+8分之1}乘75% 10除以9分之5+4乘12.5% 4分之1除以{1-2分之1-25%}

(1/2+1/8)×75℅
=(4/8+1/8)×3/4
=5/8×3/4
=15/32
10÷5/9+4×12.5℅
=10×9/5+4×1/8
=18+1/2
=18又1/2
1/4÷(1-1/2-25℅)
=1/4÷(1-1/2-1/4)
=1/4÷(4/4-2/4-1/4)
=1/4÷1/4
=1