(1)
×7 2
-5 8
÷3 2
8 5
=
×7 2
-5 8
×3 2
5 8
=(
-7 2
)×3 2
5 8
=2×
5 8
=
;5 4
(2)
÷[(4 5
+3 5
)×2]1 2
=
÷[4 5
×2]11 10
=
÷4 5
11 5
=
;4 11
(3)
×99+8 25
8 25
=
×(99+1)8 25
=
×1008 25
=32.