用简便算法解这道题1.25*67.875+125*6.7875+1.25*53.375
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用简便算法解这道题1.25*67.875+125*6.7875+1.25*53.375用简便算法解这道题1.25*67.875+125*6.7875+1.25*53.375用简便算法解这道题1.25*
用简便算法解这道题1.25*67.875+125*6.7875+1.25*53.375
用简便算法解这道题
1.25*67.875+125*6.7875+1.25*53.375
用简便算法解这道题1.25*67.875+125*6.7875+1.25*53.375
1.25*67.875+125*6.7875+1.25*53.375
=1.25*67.875+1.25*678.75+1.25*53.375
=1.25*(67.875+53.375)+1.25*678.75
=1.25*121.25+1.25*678.75
=1.25*(121.25+678.75)
=1.25*800
=1000
原式=1.25×67.875+1.25×678.75+1.25×53.375
=1.25×(67.875+678.75+53.375)
=1.25×800
=1000