Bài 4: Tính các tổng sau:
a)[25 + (-15)]+ (-29). b)512- (-88)- 400- 125.
c)-(310)+ (-210)- 907+ 107. d)2004-1975-2000+2005.
Giúp toi vứi
Bài 4: Tính các tổng sau:
a)[25 + (-15)]+ (-29). b)512- (-88)- 400- 125.
c)-(310)+ (-210)- 907+ 107. d)2004-1975-2000+2005.
Giúp toi vứi
Đáp án:
#Maia
a)[25 + (-15)]+ (-29).
= -10 + ( -29)
= – 19
b)512- (-88)- 400- 125.
= 600 – 400 – 125
= 200 – 125
= 75
c)-(310)+ (-210)- 907+ 107.
= -520 – 907 +107
= -1427 + 107
= -1320
d)2004-1975-2000+2005.
= 29 – 2000 + 2005
= -1971 + 2005
= 34
a)[25 + (-15)]+ (-29)=10+(-29)=-19
b)512- (-88)- 400- 125=512+88-400-12=512+88-(400+12)=600-412=188
c)-(310)+ (-210)- 907+ 107=-310+(-210)+(-907)+107=(-520)+(-907)+107=(-1427)+107=(-1320)
d)2004-1975-2000+2005=2004-(1975+2000)+2005=2004-3975+2005=(-1971)+2005=34