题目内容
果园里桃树比梨树多84棵,桃树棵数是梨树的3倍.两种树各有________棵.(用方程解)
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A.梨树:21棵,桃树:63棵.
B.梨树:28棵,桃树:84棵.
C.梨树:42棵,桃树:126棵.
D.梨树:24棵,桃树:48棵.