由554>500,显然手仔微波炉的标价>500,设为瞎唯x,则500*0.9+(x-500)*0.8=554解之得 x=630所以 这台微波炉的标价磨薯培为630元.
(554-500*0.9)/0.8+500=630
解:设标价为x元。0.9x500+0.8x(x-500)=554解得x=630
630设原价为x500 ×0.9+(x-500)×0.8=554解得x=630
[(554-500*0.9)/0.8]+500=630