(1)
÷[(1 5
+2 3
)×1 5
],1 13
=
÷[1 5
×13 15
],1 13
=
÷1 5
,1 15
=3;
(2)7.05-3.84-0.16,
=7.05-(3.84+0.16),
=7.05-4,
=3.05;
(3)4.3-(
+2.4÷23 5
),2 5
=4.3-(
+1),3 5
=4.3-1.6,
=2.7;
(4)8
+4.1+15 7
+4.9,2 7
=(8
+15 7
)+(4.1+4.9),2 7
=10+9,
=19;
(5)4.5÷[(0.5+
)×13 4
],1 5
=4.5÷[1.25×1
],1 5
=4.5÷1.5,
=3.