Page 20 - aljaber

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: ()
.
4+5 = 9
−4 + −5 = −9 ()

. ()

4 + −5 = −1 ()
−4 + 5 = 1 ()
−16 − −25 ( )
: (+) ×(+) = + 6 ×−5 ( )
(−)× (−) = +
. (+)× (−) = − −24 ÷ 8
−6 ×−5 ( ) (−) ×(+) = −

() −16 + −25 ( :
(−3)2 × (−2)3 ( )
)

. −16 − − 25 = −16 + 25 = 9 ()
. −16 + − 25 = −41 ()
. −6 ×−5 = 30 ()