4200-34×105 4.5÷0.25-0.75×1.2 11÷12+5÷（13+11） 16.2÷(3.2×0.25+4.6)

题目

4200-34×105 4.5÷0.25-0.75×1.2 11÷12+5÷（13+11） 16.2÷(3.2×0.25+4.6)
脱式计算上4题

答案

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