=6-4 =-12-4
=2 =-16
=-6-150 =-28+3
=-156 =-25
=（2/25）*(-2) =(1/8)/(-9/4)
=-(4/25) =9/32
=0.75+0.25+8/25 =(1/36)/(-5/36)
=33/25 =-1/5
你初中了吧？我还没初中呢！
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