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若*優先順序大於/則:先計算2*5為(2+5/2)乘(5-3/4)=19.125,再按順序計算1/19.125/4=0.0130718954 若*優先順序小於/則:先計算1/2=0.5,5/4=1.25,再把數值代進去算 若優先順序相同則則按順序計算1/2=0.5再把0.5和5代進去計算得出12.75再除以4得出3.1875
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