a)27.75+25.27=27.(75+25)=27.100=2700
b)19.83+17.19-120=19.(83+17)-120=19.100-120=1900-120=178
c)23.35+23.45+23.20=23.(35+45+20)=23.100=2300
a, 27.75+25.27-150
= 27(75+25) -150
= 27.100-150
= 2700-150=2550
b) 19.83+17.19-120
= 19(83+17)-120
= 19. 100 -120
= 1900 - 120 = 1780
c) 23.35+23.45+23.20
= 23(35+45+20)
= 23.100 = 2300
\(a,27.75+25.27-150=27.\left(75+25\right)-150=27.100-150=2700-150=2550\)
\(b,19.83+17.19-120=19.\left(83+17\right)-120=19.100-120=1900-120=1780\) \(c,23.35+23.45+23.20=23.\left(35+45+20\right)=23.100=2300\)
a) 27.75 + 25.27 – 150
= 27(75 + 25) - 150
= 27.100 - 150
= 2700 - 150
= 2550
hoặc
27.75 + 25.27 - 150
= 2025 + 675 - 150
= 2700 - 150
= 2550
b,19.83+17.19-120
=19.(83+17)-120
=19.100-120
=1900-120
=1780
c,23.35+23.45+23.20
=23.(35+45+20)
=23.100
=2300
