851/3×3/8+711/6×6/7+561/4×4/5.

问题描述:

85

1
3
×
3
8
+71
1
6
×
6
7
+56
1
4
×
4
5


85

1
3
×
3
8
+71
1
6
×
6
7
+56
1
4
×
4
5

=(80+5
1
3
)×
3
8
+(70+1
1
6
)×
6
7
+(55+1
1
4
)×
4
5

=80×
3
8
+5
1
3
×
3
8
+70×
6
7
+1
1
6
×
6
7
+55×
4
5
+1
1
4
×
4
5

=30+2+60+1+44+1,
=(30+60+44)+(2+1+1),
=134+4,
=138.