(25)(45 -34 )×23 ÷215
=11×23÷215
=253÷215
=253/215
(26)2164÷24+5010
=541/6+5010
=30601/6
(27)12.76-(4.76+5.24)
=12.76-4.76-5.24
=8-5-0.24
=3-0.24
=2.76
(28)4.8÷1.2-0.15
=4-0.15
=3.85