ML AGGARWAL CLASS 7 Chapter 1 INTEGERS EXERCISE 1.5

 

 Exercise 1.5

Question 1

$7-8 \div(-2)+3 \times(-4)$

According to BODMAS rule 

$=7-(-4)+3 \times(-4)$

=7+4+(-12)

=11-12

=-1

Question 2

$9-\{7-24 \div(8+6 \times 2-16)\}$

$=9-\{-24 \div(8+12-16)\}$

$=9-\{7-24 \div(4)\}$

$=9-\{7-6\}$

$=9-1$

$=8$

Question 3

$-11-[-6-\{3-5(8 \div 4-1)\}]$

$=-11-[-6-\{3-5(2-1)\}]$

$=-11-[-6-\{3-5(1)\}]$

$=-11-[-6-\{3-5\}]$

=-11-[-6-(-2)]

=-11-[-6+4]

=-11-(-2)

=-11+2

=-9

Question 4

$(-3) \times(-12) \div(-4)+3 \times 6$

$=(-3) \times 3+3 \times 6$

$=(-3) \times 3+18$

=-9+18

=9

Question 5

$\begin{aligned} & 14 \div(3(2-3+4))-9(5-3) \\=& 14 \div(6-9+12)-45+27 \\=& 14 \div(9)-18 \\=& \frac{14}{9}-18 \end{aligned}$