问题 解答题
计算下面各题,能简算的要简算.
(1)772-317+128-283 (2)(
11
12
-
3
4
)÷(2-
1
2

(3)(
1
4
+
1
6
+
5
12
)×36(4)120÷[45×(1-
8
9
)].
答案

(1)772-317+128-283

=772+128-(317+283)

=900-600

=300;

(2)(

11
12
-
3
4
)÷(2-
1
2

=

1
6
÷
3
2

=

1
6
×
2
3

=

1
9

(3)(

1
4
+
1
6
+
5
12
)×36

=

1
4
×36+
1
6
×36+
5
12
×36

=9+6+15

=30;

(4)120÷[45×(1-

8
9
)]

=120÷[45×

1
9
]

=120÷5

=24.

写作题
单项选择题