（2）5-（÷+)
=5-（4+），
=5-4，
=；
（3）2.8×+0.75×6.2+
=2.8×0.75+0.75×6.2+0.75，
=（2.8+6.2+1）×0.75，
=10×0.75，
=7.5；
（4）×÷(+)．
=÷，
=．點評：完成本題要注意分析式中數(shù)據(jù)的特點及內(nèi)在聯(lián)系，然后運用合適的方法進行計算．
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