(1)
×8 9
=3 4
.2 3
答:是
.2 3
(2)24×
-24×1 3
,1 4
=8-6,
=2.
答:多2.
(3)(
-1 3
)+1 4
×1 3
,1 4
=
+1 12
,1 12
=
.1 6
答:和是
.1 6
(4)(9+1÷9)×
,7 9
=(9+
)×1 9
,7 9
=9×
+7 9
×1 9
,7 9
=7+
,7 81
=7
.7 81
答:积是7
.7 81