Question

bài 1:thực hiện phép tính: a,27.75+25.27-150 b,19.83+17.19-120 c,23.35+23.45+23.20

Answer 1

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

Answer 2

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

Answer 3

\(a,27.75+25.27-150=27.\left(75+25\right)-150=27.100-150=2700-150=2550\)

\(b,19.83+17.19-120=19.\left(83+17\right)-120=19.100-120=1900-120=1780\) \(c,23.35+23.45+23.20=23.\left(35+45+20\right)=23.100=2300\)

Answer 4

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