Combined Operations in Q. Math (Guide).pdf

Co mbi ned Oper ati ons i n Q. ( Gui de)

Co mbi ned operati ons are mat he mati cal expr essi ons wher e t wo ( 2) or mor e basic operati ons

(+, -, x, ÷) i ntervene i n the sa me exerci se.

Exa mpl e:

Di vi de Mul ti pl y


3 + 8 ÷ 2 - 3 x 1

S
ubtra
ctio
n




Addi ti on Subtracti on


To resol ve thi s type of operati ons, you must take i nto account:

1-. The pr obl e ms are sol ved i n the f oll owi ng or der:


Di vi si on Mul ti pli cati on Addi ti on and Subtracti on


2-. You start by sol vi ng what is i nsi de the parent heses ( ), then the brackets and fi nall y
the key

3-. You must re me mber the steps to add nu mbers i n Z.

a) Nu mbers with equal si gns are added and the sa me si gn i s pl aced.


( - 4 ) + ( - 6 ) = - 10

( + 7 ) + ( + 2 ) = + 9; whi ch i s the sa me as what we say ( 7 ) + (2 ) = 9

b) Nu mbers with different si gns are subtracted and the si gn of the nu mber that has the
gr eat est absol ut e val ue i s pl aced.

( - 7 ) +( 9 ) = 2

( - 8 ) + ( 3 ) = -5

4-. Re me mber the Mul ti plicati on of si gns.

+ · + = + Exa mpl e (8) · (7) = 56

- · - = + Exa mpl e (- 7) · (-4) = 28

- · + =- Exa mpl e (- 2) · (7) = - 14

+ · - =- Exa mpl e ( 6) · (-3) = - 18