Thứ tự từ điển. Quan hệ 2 ngôi

1/3 + 1/5 = 8/15.

step-by-step explanation:

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step-by-step explanation:

you need to add a picture

answer:  

step-by-step explanation:

odd numbers are only divisible by 1 and itself.

even numbers are divisible by more than 1 and itself.

for example 6 is even because it is divisible by more than 1 and its self. 1 x 6= 6 ; 2 x 3= 6

and 7 is odd because only 7 x 1 equals seveb