8+88+888简便计算
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8+88+888简便计算
8+88+888简便计算
8+88+888简便计算
原式=8(1+11+111)
=8×123
=8(100+20+3)
=800+160+24
=984
=(10-2)+(100-10-2)+(1000-100-10-2)
=1000-10-6
=994-10
=984
=(10-2)+(90-2)+(890-2)
=990-6
=984
无语
=8(1+11+111)
=8×123
=8(100+20+3)
=800+160+24
=984