15-5÷12-12/7

2024-03-14 20:04

2024-03-14 23:10
15-5÷12-12/7
=14-12/7+(1-5/.12)
=12+2/7+7/12
=12+(2×12)/(7×12)+(7×7)/(12×7)
=12+24/84+49/84
=12+73/84
即十二又八十四分之七十三