Question

please help me I will mark as brainlist
if you right wrong answer I will samp
your answer​

Answer 1

Answer:

Step-by-step explanation:

1)

4/5+2/5

=> 6/5

-7/12 +3/7

lcm of 12 and 7 = 84

-7/12*7/7= -49/84

3/7*12/12= 36/84

=> -49+36/84

=> -13/84

6/5-13/84

lcm of 5 and 84= 420

6/5*84/84= 504/420

-13/84*5/5= -65/420

=> 504-65/420

=> 439/420

2)

Let the other number be x

3/7+x= 13/84

x= 13/84-3/7

lcm of 84 and 7 = 84

-3/7*12/12= -36/84

13/84*1/1= 13/84

x= 13/84-36/84

x= -23/84

Therefore, The another number is -23/84.

Hope it helps you :)