512/3÷5/3+713/4÷7/4+914/5÷9/5.
问题描述:
51
÷2 3
+715 3
÷3 4
+917 4
÷4 5
. 9 5
答
51
÷2 3
+715 3
÷3 4
+917 4
÷4 5
9 5
=(50+
)×5 3
+(70+3 5
)×7 4
+(90+4 7
)×9 5
5 9
=50×
+3 5
×5 3
+70×3 5
+4 7
×7 4
+90×4 7
+5 9
×9 5
5 9
=30+1+40+1+50+1
=123.