9/20÷[1/2×(2/5+4/5)]简算

问题描述:

9/20÷[1/2×(2/5+4/5)]简算

=9/20*2*(5/6)=9/10*(5/6)=3/4

9/20÷[1/2×(2/5+4/5)]
=9/20÷[1/2×(6/5)]
=9/20÷(3/5)
=3/4