✔ 最佳答案
比d例子你
點樣加?
6+8/9
=6x9/9+8/9------------我地叫通分母....6x9/9..其實即係6..因為後面個分母係9,所以就乘9
=54/9+8/9
=62/9
點樣減?
做法同加差唔多.....
6-8/11
=6x11/11-8/11
=66/11-8/11
=58/11
點樣乘?
6x13/18
=6x13/18------整數乘上分子度
=78/18
=13/3-----------因為可以約簡
點樣除?
6÷15/19
=6x19/15--------因為÷變乘就將分子分母調轉
=114/15
=38/5........因為可以約簡