[1-1/4-(3/8-3/4)×24]÷(-5)

问题描述:

[1-1/4-(3/8-3/4)×24]÷(-5)

[1-1/4-(3/8-3/4)×24]÷(-5)
=[1-1/4+3/8×24]÷(-5)
=[1-1/4+9]÷(-5)
=39/4÷(-5)
=-39/20