(1)(4.2/0.7+6*25分之1)*26分之5
=(6+ 6*25分之1)* 26分之5
=[6*(1+ 25分之1)]* 26分之5
=6*(25分之26)* 26分之5
=6* 5分之1
=5分之6
=1又5分之1
.
(2) 4又5分之2-(2.5+1.9)×(0.5-0.5)
=4.4 - 4.4×0
=4.4
.
(3)10-4.68÷7.2+0.05
=10 - 0.65 +0.05
=10-0.6
=9.4
.
(4)6分之5-(0.15+20分之9)÷1.8
=6分之5 - (20分之3 + 20分之9)÷ 5分之9
=6分之5 - (20分之12)× (9分之5)
=6分之5 - 3分之1
=6分之3
=2分之1
.
(5)5.35×0.25+2.65×4分之1
=(5.35+2.65)×(4分之1)
=8×(4分之1)
=2