2/(3/4-1/6)x5/9

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2/(3/4-1/6)x5/9
2/(3/4-1/6)x5/9

2/(3/4-1/6)x5/9
先算括号内,括号内=7/12
然后按前后顺序算2/(7/12)=24/7
24/7*5=120/7
120/7/9=120/63约等于1.9几