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简介:
第一类:加法
65+73+135
=65+135+73
=200+73
=273
357+288+143
=357+143+288
=500+288
=788
272+68+28
=272+28+68
=300+68
=368
129+235+171+165
=129+171+235+165
=300+400
=700
17+145+23+35
=17+23+145+35
=40+180
=220
999+99+9+3
=999+1+99+1+9+1
=1000+100+10
=1110