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36分之1-(-2分之1+9分之4)/(-2) =36分之1-(-2分之1+9分之4)*(-1/2) =1/36-(1/4-2/9) =1/36-1/4+2/9 =1/36-9/36+8/36 =0
(1.36+6.74)*9/10=7.29
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