3.5×4.8+2.2×2.4．

解：3.5×4.8+2.2×2.4
=16.8+5.28，
=22.08．
分析：本題據(jù)四則混合運算法則計算即可：先算乘除，再算加減．
點評：本題為簡單的小數(shù)四則混合運算，計算時要注意小數(shù)點的位置．
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4.7+2.3= 4.5×2= 6.9-2.5= 7.2×0.8=
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1÷2.5= 1.25×0.8= 3.2÷0.04= 0÷1.7=
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0.61+0.39= 0.56÷28= 10÷20= 4.08÷0.4=
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