[1又24/1-(3/8+1/6-3/4)×24]÷(-5)
=[1又24/1-(3/8×24+1/6×24-3/4×24）]÷(-5)
=（25/24+5）×(-1/5)
= - 29/24
[1又24/1-(3/8+1/6-3/4)×24]÷(-5)
=[1又1/24-(3/8×24+1/6×24-3/4×24）]÷(-5)
=[1又1/24-(9+4-18)]÷(-5)
=[25/24+5]÷(-5)
=25/24÷（-5）+5÷（-5）
=-5/24-1
=-1又5/24
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