题目内容

计算下面各题,能简算的要简算.
1
75
×
7
18
×75
98×
96
97
42×(
19
14
-
8
21
)
7×9(
6
7
-
1
9
)
7
10
×99+
7
10
4
9
×
3
16
+
5
12
.
(1)
1
75
×
7
18
×75,
=
1
75
×75×
7
18
,
=
7
18
;

(2)98×
96
97
,
=(97+1)×
96
97
,
=97×
96
97
+1×
96
97
,
=1+
96
97
,
=1
96
97
;

(3)42×(
19
14
-
8
21
),
=42×
19
14
-42×
8
21
,
=57-16,
=41;

(4)7×9×(
6
7
-
1
9
),
=7×9×
6
7
-7×9×
1
9
,
=54-7,
=47;

(5)
7
10
×99+
7
10
,
=
7
10
×(99+1),
=
7
10
×100,
=70;

(6)
4
9
×
3
16
+
5
12
,
=
1
12
+
5
12
,
=
1
2
.
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