问题标题：
4200-34×1054.5÷0.25-0.75×1.211÷12+5÷（13+11）16.2÷(3.2×0.25+4.6)脱式计算上4题
问题描述：
4200-34×1054.5÷0.25-0.75×1.211÷12+5÷（13+11）16.2÷(3.2×0.25+4.6)
脱式计算上4题
刘乐乐回答：
4200-34×105
=4200-3570
=630
4.5÷0.25-0.75×1.2
=18-0.9
=17.1
11÷12+5÷（13+11）
=11/12+5/24
=17/24
16.2÷(3.2×0.25+4.6)
=16.2÷(0.8+4.6)
=16.2÷5.4
=3
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