0.7*1又4/9+2又3/4*(-15)+0.7*5/9+1/4*(-15)

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0.7*1又4/9+2又3/4*(-15)+0.7*5/9+1/4*(-15)
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0.7*1又4/9+2又3/4*(-15)+0.7*5/9+1/4*(-15)
0.7*1又4/9+2又3/4*(-15)+0.7*5/9+1/4*(-15)

0.7*1又4/9+2又3/4*(-15)+0.7*5/9+1/4*(-15)