八之三+五又十分之七=?

= 3/8 + 57/10
= 15/40 + 228/40
= ( 15 + 228 ) / 40
= 243/40
= 6 又 40 分 之 3

八之三+五又十分之七
=3/8 +57/10
=15/40 + 228/40
=243/40
=6又 3/40

九分之四+六分之五
=8/18 + 15/18
=23/18
=1又 5/18

先 * , / 後 + , -
然後通分母
3/8 + 57/10
=(30/80) + ( 456/80 )
=486/80
=243 / 40

=六又４０份之三