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怎样简便怎样算3-19×112+560.9-(0.15+0.35÷57)7.25-337+3.75-647(2-34×45)÷(112+415)

题目详情
怎样简便怎样算
3-
1
9
×1
1
2
+
5
6
              0.9-(0.15+0.35÷
5
7

7.25-3
3
7
+3.75-6
4
7
        (2-
3
4
×
4
5
)÷(
1
12
+
4
15
▼优质解答
答案和解析
① 3-
1
9
×1
1
2
+
5
6
 
=3-
1
9
×
3
2
+
5
6
 
=3-
1
6
+
5
6

=2
5
6
+
5
6

=3
2
3

② 0.9-(0.15+0.35÷
5
7

=0.9-(0.15+
7
20
÷
5
7

=0.9-(0.15+
7
20
×
7
5

=0.9-(0.15+0.49)
=0.9-0.64
=0.26;
③ 7.25-3
3
7
+3.75-6
4
7
 
=(7.25+3.75)-(3
3
7
+6
4
7

=11-10
=1;
④ (2-
3
4
×
4
5
)÷(
1
12
+
4
15

=(2-
3
5
)÷
7
20

=
7
5
×
20
7

=4.