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$第5课时 、1.70302.90103.2001444.甲 5.280六6.乙7.A 4. 、1.(1)A:2680×0.75=2010(元), B:2680-2600÷200×20=2420(元) 答:略 (2)在A商城买更省钱。2680-2010=670 答:略 2.A:5000-4800÷1600×500=3500元), B:5000×0.8×0.85=3400(元)答:略 3.(1)甲:60×0.65=39(元) 乙:60-18=42(元)答:略 (2)在甲店购买更划算 60-39=21(元)答:略