数学题：①5分之3×9分之5+5分之2=?②120×（10分之9-65%）=？③0.54×0.75+4分之3×46%=？要详细解题过程

①5分之3×9分之5+5分之2=3/5*5/9+2/5=15/45+2/5=5/15+6/15=11/15
②120×（10分之9-65%）=120*（9/10-65/100）=120*（90/100-65/100）=120*25/100=120*1/4=30
③0.54×0.75+4分之3×46%=0.54*0.75+3/4*46%=0.54*0.75+0.75*0.46=0.75*（0.54+0.46）=0.75*1=0.75

①5分之3×9分之5+5分之2=1/3 +2/5 = (5+6)/15=11/15

②120×（10分之9-65%）=120*(0.9-0.65)=120*0.25=120/4=30

③0.54×0.75+4分之3×46%=(0.54+0.46)* 3/4 = 3/4

：①5分之3×9分之5+5分之2
=1/3+2/5
=11/15
②120×（10分之9-65%）
=120×（0.9-0.65）
=120×0.25
=30
③0.54×0.75+4分之3×46%
=(0.54+0.46)×0.75
=0.75

=3/5*5/9+2/5
=1/3+2/5
=11/15

=120*(9/10-13/20)
=120*3/4
=90

=0.54*0.75+3/4*23/50
=0.405+69/200
=750/1000
=3/5