33又1/3*-2.5*-7*4*-0.3

1个回答

  • 33又1/3*(-2.5)*(-7)*4*(-0.3)

    =-100/3*0.3*(2.5*4)*7

    =-30*10*7

    =-2100

    -13*2/3-0.34*2/7+1/3*(-13)-5/7*0.34

    =-13*(2/3+1/3)-0.34*(2/7+5/7)

    =-13-0.34

    =-13.34

    某商品价格为a元,降价10%后又降价10%,销售量增,商场决定再提价20%,则提价后这种商品价格为?

    a×(1-10%)×(1-10%)×(1+20%)

    =a× 81%×120%

    =0.972a元

    49又24/25*5

    =(50-1/25)*5

    =50*5-1/25*5

    =250-1/5

    =249.8