题目内容

计算
①1
3
7
÷1
2
3
+7.5+
3
4
÷1
3
4
②5
3
11
-(2.375-1
8
11
)-3
5
8
③87
1
2
×43+430×1
1
4
④1
1
42
+2
1
56
+3
1
72
+4
1
90
①1
3
7
÷1
2
3
+7.5+
3
4
÷1
3
4

=
10
7
÷
5
3
+7.5+
3
4
÷
7
4

=
6
7
+7.5+
3
7

=1
2
7
+7.5,
=8
11
14


②5
3
11
-(2.375-1
8
11
)-3
5
8

=5
3
11
-2.375+1
8
11
-3
5
8

=5
3
11
+1
8
11
-2.375-3
5
8

=7-2.375-3
5
8

=4.625-3.625,
=1;

③87
1
2
×43+430×1
1
4

=87
1
2
×43+43×1
1
4
×10,
=(87
1
2
+1
1
4
×10)×43,
=(87
1
2
+
25
2
)×43,
=100×43,
=4300;

④1
1
42
+2
1
56
+3
1
72
+4
1
90

=(1+2+3+4)+[(
1
6
-
1
7
)+(
1
7
-
1
8
)+(
1
8
-
1
9
)+(
1
9
-
1
10
)],
=10+[
1
6
-
1
7
+
1
7
-
1
8
+
1
8
-
1
9
+
1
9
-
1
10
],
=10+
1
15

=10
1
15
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