如果3x﹣5与互为倒数,那么x2﹣x3的值是 .
:3=10: ==1.5: .
30:42==45÷ ≈ %.
÷ == %= : = = 成.
18÷ = :4=1.5== %
:20=24÷ = %=二成= 折.