题目内容

怎样算简便怎样算.
3
4
×
8
9
+
1
9
×0.75
1
3
+
1
4
+
1
6
)×12.
(1)
3
4
×
8
9
+
1
9
×0.75,
=
3
4
×
8
9
+
1
9
×
3
4

=
3
4
×(
8
9
+
1
9
)

=
3
4
×1

=
3
4


(2)(
1
3
+
1
4
+
1
6
)×12,
=
1
3
×12+
1
4
×12+
1
6
×12

=4+3+2,
=9;
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