78.1x54.3+45.45x78.1+78.1/4
=78.1x54.3+45.45x78.1+78.1×0.25
=78.1x（54.3+45.45+0.25）
=78.1×100
=7810
78.1x54.3+45.45x78.1+78.1/4简便计算
78.1x54.3+45.45x78.1+78.1/4
=78.1x54.3+45.45x78.1+78.1×0.25
=78.1x（54.3+45.45+0.25）
=78.1×100
=7810