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4/9 x 3/8 + 5/8 = 1/6 + 5/8 = 19/24

1/3 : 1/6 - 5/11 = 2 - 5/11 = 17/11

1/6 : 1/4 x 9/8 = 2/3 x 9/8 = 3/4

Cái này là phân số hay phép chia vậy bạn

\(\dfrac{4}{9}\) x \(\dfrac{3}{8}\) + \(\dfrac{5}{8}\) = \(\dfrac{1}{6}\) + \(\dfrac{5}{8}\) = \(\dfrac{19}{24}\)

\(\dfrac{1}{3}\) : \(\dfrac{1}{6}\) - \(\dfrac{5}{11}\) = 2 - \(\dfrac{5}{11}\) = \(\dfrac{17}{11}\)

\(\dfrac{1}{6}\) : \(\dfrac{1}{4}\) x \(\dfrac{9}{8}\) = \(\dfrac{2}{3}\) x \(\dfrac{9}{8}\) = \(\dfrac{3}{4}\)

B = \(\left(-1\dfrac{1}{6}\right)\) : \(\left(\dfrac{-10}{3}+\dfrac{9}{4}\right)\) - \(\left(-\dfrac{3}{8}\right)\) : \(\left(8-\dfrac{51}{8}\right)\)

B = \(\dfrac{-7}{6}\) : \(\dfrac{-13}{12}\) - \(\left(-\dfrac{3}{8}\right)\) : \(\dfrac{13}{8}\)

B = \(\dfrac{14}{13}\) - \(\dfrac{-3}{13}\)

B = \(\dfrac{17}{13}\)

Lời giải

0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10

= (1 + 9) + (2 + 8) + (3 + 7) + ( 4 + 6) + 10 + 5

= 10 + 10 + 10 + 10 + 10 + 5

= 55

Vậy đáp án đúng là B

10.213

11. 2 giờ 55 phút

12. 4 ngày 21 giờ

13.

a: 6,008

b: 4500

c: 5,628

d: 4,009

=(4x0.25)x(2x0.5)

=1x1=1

B=1-2-3+4+5-6-7+8+..........+21-22-23+24

B=(1-2-3+4)+(5-6-7+8)+.......+(21-22-23+24)

B=0+0+............+0

B=0