果园里有12行苹果树和梨树,每行都是25颗。苹果树和梨树有多少棵?
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梨纳亩树:(25-4)÷(2+1)=7棵苹果树森茄扒此昌:7×2+4=18棵[hallo.lixunmj.cn/article/270163.html]
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