ai dai giup minh bai 108,111 trang 98,99 09/08/2021 Bởi Parker ai dai giup minh bai 108,111 trang 98,99
Bài 108 – Nếu a > 0 thì –a < a và –a < 0. – Nếu a < 0 thì –a > a và –a > 0. Bài 111 a) (–13)+(–15)+(–8) =–(13+5+8) =–36 b) 500–(–200)–210–100 =500+200–210–100 =500+200–(210+100) =700–310 =390 c) –(–129)+(–119)–301+12 =129–119–301+12 =(129+12)–(119+301) =141–420 =–279 d) 777–(–111)–(–222)+20 =777+111+222+20 =(777+111+222)+20 =1110+20=1130. Bình luận
Bài 108
– Nếu a > 0 thì –a < a và –a < 0.
– Nếu a < 0 thì –a > a và –a > 0.
Bài 111
a) (–13)+(–15)+(–8)
=–(13+5+8)
=–36
b) 500–(–200)–210–100
=500+200–210–100
=500+200–(210+100)
=700–310
=390
c) –(–129)+(–119)–301+12
=129–119–301+12
=(129+12)–(119+301)
=141–420
=–279
d) 777–(–111)–(–222)+20
=777+111+222+20
=(777+111+222)+20
=1110+20=1130.