Question

please, help me with this?​

Answer 1

Answer:

1) -1/12

Step-by-step explanation:

step 1: 5/6*2=10/12

step 2: 10/12-11/12= -1/12

Answer 2

Step-by-step explanation:

5/6+(-11/12)

lcm is 12

10-11/12

-1/12

Ans=-1/12

2)associative property formula

a+(b+c)=(a+b)+c

a=2/3,b=-21/18,c=90/14

2/3(-21/18+90/14)=(2/3-21/18)90/14

221/126≠-45/14

3)2/3×5/5 , 4/5×3/3

10/15,20/15

11/15,12/15,13/15,14/15,16/15