摘要： 解:(1)去超市购买所需费用 即··········································································································· 1分 去超市购买所需费用 即········································································································· 2分 当时.即 当时.即 当时.即 ·························································································································· 4分 综上所述:当时.去超市购买更合算,当时.去超市或超市购买一样,当时.去超市购买更合算．···················································································································· 5分 (2)当时.即购买10副球拍应配120个乒乓球 若只去超市购买的费用为: (元)············································································· 6分 若在超市购买10副球拍.去超市购买余下的乒乓球的费用为: (元)··············································································· 7分 最佳方案为:只在超市购买10副球拍.同时获得送30个乒乓球.然后去超市按九折购买90个乒乓球． 8分

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