Đáp án C

2392 + 14168 : 46 = 2392 + 308 = 2700

46 857 + 3444 : 28 = 46 857 + 123 = 46 980

46 857 + 3444 : 28

= 46 857 + 123

= 46980

Hok tốt

   \(\dfrac{1}{72}\) x \(\dfrac{144}{23}+\dfrac{1}{46}\)

= \(\dfrac{2}{144}\) x \(\dfrac{144}{23}\) \(+\dfrac{1}{46}\)

= \(\dfrac{2}{23}+\dfrac{1}{46}\)

= \(\dfrac{4}{46}+\dfrac{1}{46}\)

\(=\dfrac{5}{46}\)

\(1.\) 12 x 11 + 21 x 11 x 11 + 11 x 33

= ( 12 x 11 ) + ( 21 x 11 x 11 ) + ( 11 x 33 )

= \(132+2541+363\)

= \(3036\)

132x11-11x32-54x11

= ( 132 x 11 ) - ( 11 x 32 ) - ( 54 x 11 )

\(=1452-352-594\)

= \(506\)

\(2.\)

45 x 32 + 1245

= ( 45 x 32 ) + 1245

= 1400 + 1245

= 2685

75 x 18 + 75 x 21

= ( 75 x 18 ) + ( 75 x 21 )

= 1350 + 1575

= 2925

12 x (27+46) -1567

= 12 x 73 - 1567

= ( 12 x 73 ) - 1567

= 876 - 1567

= - 691

Đáp án:

72 : 9   + 170   = 8 + 170 = 178

72 : 8 + 16

= 9 + 16

= 25

123² - 123.46 + 23²

= 123² - 2.123.23 + 23²

= (123 - 23)²

= 100²

= 10000

72 : (2 x 4) = 72 : 8 = 9

   1574,8 :25,4 + 72 x 0,5

=  62 + 36

= 98

  1574,8 :25,4 + 72 x 0,5

=  62 + 36

= 98