68.75×16+3.28×687.5+197×6.875+0.315×6875
=68.75×16+32.8×68.75+19.7×68.75+31.5×68.75
=68.75×（16+32.8+19.7+31.5）
=68.75×100
=6875
希望我的回答对你有所帮助.