4÷4/5-4/5÷4 7/18*1/4+3/4÷18/7 简便运算

4÷4/5-4/5÷4 7/18*1/4+3/4÷18/7 简便运算
4÷4/5-4/5÷4 7/18*1/4+3/4÷18/7 简便运算

4÷4/5-4/5÷4 7/18*1/4+3/4÷18/7 简便运算
4÷4/5-4/5÷4
=5-1/5
=4又4/5
7/18*1/4+3/4÷18/7
=7/18x1/4+3/4x7/18
=7/18x(1/4+3/4)
=7/18x1
=7/18

4÷4/5-4/5÷4
=4*5/4-4/5*1/4
=4*5/4-1/5
=5-1/5
=4又4/5

7/18*1/4+3/4÷18/7
=7/18*1/4+3/4*7/18
=7/18*(1/4+3/4)
=7/18
PS：这类题其实就是把算式里面的公因式（相同部分）给提出来在进行预算、