题目内容

计算下面各题,能简算的要简算.
(1)(
7
8
+
13
16
)÷
13
16

(2)50×
1
5
÷
1
500
×
1
5000

(3)
44
45
×99+
44
45

(4)
5
8
-[(
1
2
+
3
5
)×
5
11
]
(5)98×
2
97

(6)21-
19
20
×21.
(1)(
7
8
+
13
16
)÷
13
16

=
27
16
×
16
13

=
27
13


(2)50×
1
5
÷
1
500
×
1
5000

=50×
1
5
×500×
1
5000

=1;

(3)
44
45
×99+
44
45

=
44
45
×(99+1),
=
44
45
×100,
=97
7
9


(4)
5
8
-[(
1
2
+
3
5
)×
5
11
],
=
5
8
-[
11
10
×
5
11
],
=
5
8
-
1
2

=
1
8


(5)98×
2
97

=(97+1)×
2
97

=97×
2
97
+1×
2
97

=2+
2
97

=2
2
97


(6)21-
19
20
×21,
=(1-
19
20
)×21,
=
1
20
×21,
=
21
20
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