Question

please gave my answer I will mark it as branliest and I will follow him also
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Answer 1

Answer:

Step-by-step explanation:

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Answer 2

Answer:

Step-by-step explanation:

a-(b-c) not equal to (a-b)-c

(1) a-(b-c)=2/3-((-5/6)-(-1/2))

2/3-(1/2-5/6)

2/3-((3-5)/6)

2/3+2/6=4+2/6=6/6=1

and

(a-b)-c=(2/3-(-5/6))-(-1/2)

(2/3+5/6)+1/2=(4+5)/6+1/2

=9/6+1/2=12/6=2

so a-(b-c) not equal to (a-b)-c=>1 not equal to 2

(2) a-(b-c)=-1/2-(3/4-(-7/8))

=-1/2-(6+7)/8=-1/2-13/8

=-4-13/8=-17/8

(a-b)-c=(-1/2-(3/4))-(-7/8)

(-1/2-3/4)+7/8

(-2-3)/4+7/8

=(-10+7)/8=-3/8

so a-(b-c) not equal to (a-b)-c=>-17/8 not equal to -3/8