12.13.14题,
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12.13.14题,
12.13.14题,
12.13.14题,
12 小华32元 小亮31元
13 6400x(75%+60%)=8640(吨)
14 梨的价钱=3.6x5/6=3(元/kg) 12kg梨的钱=3x12=36(元)
能买苹果:36÷3.6=10(kg)