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计算下面各题.①0.8×[(5-0.68)÷2.4];②12-18.85÷(1.52+4.28);③(14.8-14.8×0.5)×3.5;④4.59÷[(1.2+0.6)×5].

题目详情
计算下面各题.
①0.8×[(5-0.68)÷2.4];
②12-18.85÷(1.52+4.28);
③(14.8-14.8×0.5)×3.5;         
④4.59÷[(1.2+0.6)×5].
▼优质解答
答案和解析
①0.8×[(5-0.68)÷2.4]
=0.8×[4.32÷2.4]
=0.8×1.8
=1.44;
②12-18.85÷(1.52+4.28)
=12-18.85÷5.8
=12-3.25
=8.75;
③(14.8-14.8×0.5)×3.5
=(14.8-7.4)×3.5
=7.4×3.5
=25.9;
④4.59÷[(1.2+0.6)×5]
=4.59÷[1.8×5]
=4.59÷9
=0.51.