(-270)*0.25+0.25*21.5+8.5*(-25%)=多少

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(-270)*0.25+0.25*21.5+8.5*(-25%)=多少(-270)*0.25+0.25*21.5+8.5*(-25%)=多少(-270)*0.25+0.25*21.5+8.5*(-25

(-270)*0.25+0.25*21.5+8.5*(-25%)=多少
(-270)*0.25+0.25*21.5+8.5*(-25%)=多少

(-270)*0.25+0.25*21.5+8.5*(-25%)=多少
(-270)*0.25+0.25*21.5+8.5*(-25%)
=(-270)*0.25+0.25*21.5-8.5*0.25
=(-270+21.5-8.5)*0.25
=-257*0.25
=-64.25

=(1-1/51)*(1+1/51)*(1-1/52)*(1+1/52)*..............*(1-1/152)*(1+1/152)
=(50/51)*(52/51)*(51/52)*(53/52)*..............*(151/152)*(153/152)
中间约分
=(50/51)*(153/152)
=75/76