题目内容

用合理的方法计算
19
7
8
×7
2.8×1
3
4
+7
1
5
×1
3
4
7
13
×0.91×
2
7
5
8
+
3
8
×
2
15
(
7
18
+
5
27
)×
9
35
97
100
×99.
(1)19
7
8
×7,
=(19+
7
8
)×7,
=19×7+
7
8
×7,
=133+
49
8
,
=139
1
8
;

(2)2.8×1
3
4
+7
1
5
×1
3
4
,
=(2.8+7
1
5
)×1
3
4
,
=(2.8+7.2)×1
3
4
,
=10×
7
4
,
=
35
2
;

(3)
7
13
×0.91×
2
7
,
=(
7
13
×
2
7
)×0.91,
=
2
13
×0.91,
=0.14;

(4)
5
8
+
3
8
×
2
15
,
=
5
8
+
1
20
,
=
27
40
;

(5)(
7
18
+
5
27
)×
9
35
,
=
7
18
×
9
35
+
5
27
×
9
35
,
=
1
10
+
1
21
,
=
31
210
;

(6)
97
100
×99,
=
97
100
×(100-1),
=
97
100
×100-
97
100
×1,
=97-
97
100
,
=96
3
100
.
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