5.6×0.375+

3

8

×5.4-0.375×0.9，
=5.6×0.375+0.375×5.4-0.375×0.9，
=（5.6+5.4-0.9）×0.375，
=10.1×0.375，
=（10+0.1）×0.375，
=10×0.375+0.1×0.375，
=3.75+0.0375，
=3.7875．