总述：本次共解1题。其中
           ☆算术计算1题

〖1/1算式〗
    作业：求算式 (-20%-17.5%)^2×25%+(10%-17.5%)^2×25%+(30%-17.5%)^2×25%+(50%-17.5%)^2×25% 的值.
    题型：数学计算
    解:
          (-20%-17.5%)^2×25%+(10%-17.5%)^2×25%+(30%-17.5%)^2×25%+(50%-17.5%)^2×25%
        =-0.375^2×25%+(10%-17.5%)^2×25%+(30%-17.5%)^2×25%+(50%-17.5%)^2×25%
        =-0.375^2×25%+(-0.075)^2×25%+(30%-17.5%)^2×25%+(50%-17.5%)^2×25%
        =-0.375^2×25%+(-0.075)^2×25%+0.125^2×25%+(50%-17.5%)^2×25%
        =-0.375^2×25%+(-0.075)^2×25%+0.125^2×25%+0.325^2×25%
        =-0.375^2×0.25+-0.075^2×25%+0.125^2×25%+0.325^2×25%
        =-0.375^2×0.25+-0.075^2×0.25+0.125^2×25%+0.325^2×25%
        =-0.375^2×0.25+-0.075^2×0.25+0.125^2×0.25+0.325^2×25%
        =-0.375^2×0.25+-0.075^2×0.25+0.125^2×0.25+0.325^2×0.25
        =0.140625×0.25+(-0.075)^2×0.25+0.125^2×0.25+0.325^2×0.25
        =0.140625×0.25+0.005625×0.25+0.125^2×0.25+0.325^2×0.25
        =0.140625×0.25+0.005625×0.25+0.015625×0.25+0.325^2×0.25
        =0.140625×0.25+0.005625×0.25+0.015625×0.25+0.105625×0.25
        =0.035156+0.005625×0.25+0.015625×0.25+0.105625×0.25
        =0.035156+0.001406+0.015625×0.25+0.105625×0.25
        =0.035156+0.001406+0.003906+0.105625×0.25
        =0.035156+0.001406+0.003906+0.026406
        =0.036562+0.003906+0.026406
        =0.040468+0.026406
        =0.066874
    答案:(-20%-17.5%)^2×25%+(10%-17.5%)^2×25%+(30%-17.5%)^2×25%+(50%-17.5%)^2×25%=0.066874

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