a)1945−(−945)−(+945)−2015
b) 59.(41−89)+41.(−89−59)
c) −77.(52+23)+23.(77−52)
d) 142.(16+42)+(−42).(16+142)
e) (−45).(55−24)+(−55).(−45−24)
f) −123−(278−546)−(−123+278)
a)1945−(−945)−(+945)−2015
b) 59.(41−89)+41.(−89−59)
c) −77.(52+23)+23.(77−52)
d) 142.(16+42)+(−42).(16+142)
e) (−45).(55−24)+(−55).(−45−24)
f) −123−(278−546)−(−123+278)
a)1945−(−945)−(+945)−2015
= 1945 + 945 – 945 – 2015
= -70
b) 59.(41−89)+41.(−89−59)
= 59 . (-48) + 41 . ( -148 )
= -8900
c) −77.(52+23)+23.(77−52)
= -77 . 75 + 23 . 25
= -5200
d) 142.(16+42)+(−42).(16+142)
= 142 . 58 – 42 . 158
= 1600
e) (−45).(55−24)+(−55).(−45−24)
=-45 . 31 – 55 . ( – 69 )
=2400
f) −123−(278−546)−(−123+278)
= -124 – ( – 268 ) – 155
= -124 + 268 – 155
= – 11
`\text{~~Holi~~}`
`a. 1945-(-945)-(+945)-2015`
`= 1945+945-945-2015`
`= 1945-2015`
`= -70`
`b. 59×(41-89)+41×(-89-59)`
`= 59×(-48)+41×(-148)`
`= -2832-6068`
`= -8900`
`c. -77×(52+23)+23×(77-52)`
`= -77×75+23×25`
`= -5775+575`
`= -5200`
`d. 142×(16+42)+(-42)×(16+142)`
`= 142×58-42×158`
`= 8236-6636`
`= 1600`
`e. (-45)×(55-24)+(-55)×(-45-24)`
`= -45×31-55×(-69)`
`= -1395+3795`
`= 2400`
`f. -[123-(278-546)]-(-123+278)`
`= -123+278-546+123-278`
`= (-123+123)+(278-278)-546`
`= 0+0-546`
`= -546`