计算:411/3×3/4+511/4×4/5+611/5×5/6=_.
问题描述:
计算:41
×1 3
+513 4
×1 4
+614 5
×1 5
=______. 5 6
答
41
×1 3
+513 4
×1 4
+614 5
×1 5
5 6
=(40+
)×4 3
+(50+3 4
)×5 4
+(60+4 5
)×6 5
,5 6
=40×
+3 4
×4 3
+50×3 4
+4 5
×5 4
+60×4 5
+5 6
×6 5
,5 6
=30+1+40+1+50+1,
=123.
故答案为:123.