北师大版 三年级上册 第三单元 加与减,11810495,1,2,3,100100100300,184517,30017317,22295,317,118, 104,2,1,2,2,222, 95,7,1,1,3,118,104, 95,1,7,1,3,1,答:三年级一共捐书317本。,10310998,103, 109,2,1,1,2,212, 98,0,1,1,3,103,109, 98,1,0,1,3,1,10310998,21298,310(本),310(本),答:四年级一共捐书310本。,3173107(本),答:三年级比四年级多捐7本。,1.,2.用竖式计算。,72711486,397304120,475260149,292450108,3.,4.,