学校参加植树活动,四年级4个班,每班准备植树25棵,三年级5个班,每班准备植树12棵。两个年级共准备植树多少棵?._+]2L*f2U)C1q;Z)R7U:H5~3o4@5D/Q'i
算式:提示)F)F+?)I1k'P.s;K+s)J._+]2L*f2U)C1q;Z)R7U:H5~3o4@5D/Q'i
答:两个年级共准备植树3D*j3k'a-a(K'd+Z0l棵。._+]2L*f2U)C1q;Z)R7U:H5~3o4@5D/Q'i