Question

plz solve with explanation and send me plz I can't able to solve this I will mark it as crown and follow also plz​

Answer 1

Step-by-step explanation:

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

a=1/2,b= -2/3,c=7/6

a+(b+c)=(1/2)+[(-2/3)+7/6]

=(1/2)+[(-4+7)/6]

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

=1/2+1/2

=1

(a+b)+c=[(1/2)+(-2/3)]+7/6

=[(3-4)/6]+7/6

=(-1/6)+7/6

=(-1+7)/6

=1

hence a+(b+c)=(a+b)+c=1

2)(2/5)*(3/4)+(1/25)*(1/2)-(3/10)*(2/10)

=(6/20)+(1/50)-(6/100)

=(30+3-6)/100

=27/100

Answer 2

Step-by-step explanation:

(7)

$= > a + (b + c) = (a + b) + c$

$= > \frac{1}{2} + ( \frac{ - 2}{3} + \frac{7}{6} ) = ( \frac{1}{2} + \frac{ - 2}{3} ) + \frac{7}{6}$

$= > \frac{1}{2} + \frac{3}{6} = \frac{ - 1}{6} + \frac{7}{6}$

$= > \frac{2}{2} = \frac{6}{6}$

$= > 1 = 1$

(8)

$= > \frac{2}{5} \times \frac{3}{4} + \frac{1}{25} \times \frac{1}{2} - \frac{3}{10} \times \frac{2}{10}$

$= > \frac{1}{5} \times \frac{3}{2} + \frac{1}{50} - \frac{3}{5} \times \frac{1}{10}$

$= > \frac{3}{10} + \frac{1}{50} - \frac{3}{50}$

$= > \frac{1 - 3 + 15}{50}$

$= > \frac{13}{50}$