题目内容

能简算的要简算
①7.6×0.45+6.5×0.76-7
3
5
×0.1
②
2
17
×
2
15
+
2
17

③
1994
1995
×1995
④
4
5
×
3
7
÷
4
5
×
3
7

⑤
1
2
+
1
6
+
1
12
+
1
20
+
1
30
.
①7.6×0.45+6.5×0.76-7
3
5
×0.1,
=7.6×0.45+0.65×7.6-7.6×0.1,
=7.6×(0.45+0.65-0.1),
=7.6×1,
=7.6;

②
2
17
×
2
15
+
2
17
,
=
2
17
×(
2
15
+1),
=
2
17
×
17
15
,
=
2
15
;

③
1994
1995
×1995=1994;

④
4
5
×
3
7
÷
4
5
×
3
7
,
=(
4
5
×
5
4
)×(
3
7
×
3
7
),
=1×
9
49
,
=
9
49
;

⑤
1
2
+
1
6
+
1
12
+
1
20
+
1
30
,
=(1-
1
2
)+(
1
2
-
1
3
)+(
1
3
-
1
4
)+(
1
4
-
1
5
)+(
1
5
-
1
6
),
=1-
1
2
+
1
2
-
1
3
+
1
3
-
1
4
+
1
4
-
1
5
+
1
5
-
1
6
,
=1-
1
6
,
=
5
6
.
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