Question

6.2除以中括号5.49减括号3.49+1.69括号中括号简便运算？

6.2除以中括号5.49减括号3.49+1.69，括号中括号简便运算

Answer 1

6.2÷[5.49-(3.49+1.69)]
=6.2÷[5.49-3.49-1.69]
=6.2÷(2-1.69)
=6.2÷1.31
=620/131。