5+6/5×6−6+7/6×7+7+8/7×8−8+9/8×9+9+10/9×10.
问题描述:
−5+6 5×6
+6+7 6×7
−7+8 7×8
+8+9 8×9
. 9+10 9×10
答
-5+6 5×6
+6+7 6×7
−7+8 7×8
+8+9 8×9
,9+10 9×10
=
+1 5
−1 6
−1 6
+1 7
+1 7
−1 8
−1 8
+1 9
+1 9
,1 10
=
+1 5
,1 10
=
.3 10