题目内容

4
7
13
×2
1
7
+4
2
7
×4
7
13
+6
4
7
×4
7
13

61
1
5
×
5
6
+71
1
6
×
6
7
+91
1
8
×
8
9
(1)4
7
13
×2
1
7
+4
2
7
×4
7
13
+6
4
7
×4
7
13

=4
7
13
×(2
1
7
+4
2
7
+6
4
7
),
=4
7
13
×13,
=(4+
7
13
)×13,
=4×13+
7
13
×13,
=52+7,
=59;

(2)61
1
5
×
5
6
+71
1
6
×
6
7
+91
1
8
×
8
9

=(60+
6
5
)×
5
6
+(70+
7
6
)×
6
7
+(90+
9
8
)×
8
9

=60×
5
6
+
6
5
×
5
6
+70×
6
7
+
7
6
×
6
7
+90×
8
9
+
9
8
×
8
9

=50+1+60+1+80+1,
=(50+60+80)+(1+1+1),
=190+3,
=193.
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