解法1:
64+29
=(60+4)+(30-1)
=60+4+30-1
=90+3
=93
解法2:
64+29=(60+4)+(20+9)
=60+4+20+9
=80+13
解法3:
64+29=(70-6)+(30-1)
=70-6+30-1
=100-7
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