a.=18 : 9 + 5 .8
=2+40
=42
b. = -(12+42)
= -54
c. =53.25+53.75+27.18+27.82
=53.(25+75)+27.(18+82)
=53.100+27.100
=100.(53+27)
=100.80
=8000
d.{75+(-75)}+(-350)
=0+(-350)
=-350
a) 18 : 32 + 5 . 23
= 18 : 9 + 5 . 8
= 2 + 40
= 42
b) (-12) + (-42)
= -(12+42)
= - 54
c) 53.25 + 53.75 + 27.18 + 33.82
= 53.25 + 53.75 + 27 .18 + 27.82
= 53.(25+75) + 27.(18+82)
= 53.100 + 27.100
= 100.(53 + 27)
= 100. 80
= 8000
d) 75 + (-350) + (-75)
= 75 + (-75) + (-350)
= 0 + (-350)
= -350
Chúc bạn học tốt!
a) 18 : 32 + 5 . 23
= 18 : 9 + 5 . 8
= 2 + 40
= 42
b) ( -12) + ( -42)
= -(42 + 12)
= -54
c) 53 . 25 + 53 . 75 + 27 . 18 + 33 . 82
= 53 . 25 + 53 . 75 + 27 . 18 + 27 . 82
= 53 . (25 + 75) + 27 . (18 + 82)
= 53 . 100 + 27 . 100
= 100 . (53 + 27)
= 100. 80
= 8 000
d) 75 + (-350) + (-75)
= 75 + (-75) + (-350)
= 0 + (-350)
= -350.
Chúc bạn học tốt!