[6分之5-(8分之27×15分之9-3分之2)]÷8分之7

问题描述:

[6分之5-(8分之27×15分之9-3分之2)]÷8分之7

=【5/6-(81/40-2/3)】÷7/8
=(5/6-81/40+2/3)÷7/8
=(5/6+2/3-81/40)÷7/8
=(3/2-81/40)÷7/8
=(60/40-81/40)÷7/8
= -21/40÷7/8
= -21/40×8/7
= -3/5