A) 1000000 - 107492 : 154 x 28 + 1000

= 1000000 - 19544 + 1000

= 981456

B) 8/15 + 4/7 + 14/30 + 12/21 + 5

= 15/7 + 5

= 50/7

C) 9/13 : 6/11 - 5/12 : 6/11

= 9/13 x 11/6 - 5/12 x 11/6

= (9/13 - 5/12) x 11/6

= 43/156 x 11/6

= 473/936

Bài 2

1) X x2 + X x 1/5 = 8/5 

X x (2 + 1/5 ) = 8/5

X x 11/5 = 8/5

X = 8/5 x 5/11

X = 8/11

2) X : 3/8 = 4/3 : 3/6 

X : 3/8 = 8/3

X = 8/3 x 3/8

X = 1

a) 1 000 000 - 107 492 : 154 x 28 + 1000

=  1 000 000 -            698     x 28 + 1000

=  1 000 000 -                    19544 + 1000

=                    980 456                 + 1000

=                                       981 456

b) 8/15 + 4/7 + 14/30 + 12/21 + 5

  = ( 8/15 + 14/30 ) + ( 4/7 + 12/21 ) + 5

  = ( 16/30 + 14/30 ) + ( 12/21 + 12/21 ) + 5

  =            30/30      +          24/21         + 5

  =               1          +         24/21          + 5

  =           ( 1 + 5 ) + 24/21

  =                6      + 24/21

  =                     150/21

 =                         50/7        

a)    12 : { 390 : [ 500 - ( 125 + 35. 7 ) ] }

   =  12 : { 390 : [ 500 - ( 125 + 245 ) ] }

   =   12 : { 390 : [ 500 - 370 ] }

   =   12 : { 390 : 130 }

    =   12 : 3

    =     4

b)  12000 - ( 1500 .2 + 1800 .3 + 12 . 2 : 3 )

  = 12000 - ( 3000 + 5400 + 8 )

  = 12000 - 8408

  = 3592

a) 12 : { 390 : [ 500 - ( 125 + 35 . 7 ) ] }

= 12 : {390 : [500 - (125 + 245)]}

= 12 : [390 : (500 - 370)]

= 12 : (390 : 130)

= 12 : 3 = 4.

b/ 12000 - ( 1500 . 2 + 1800 . 3 + 12 . 2 : 3 )

= 12000 - (3000 + 5400 + 24 : 3)

= 12000 - (8400 + 24 : 3)

= 12000 - (8400 + 8)

= 12000 - 8408

= 3592.

a, \(A=\dfrac{1}{3}.\dfrac{-6}{-3}.\dfrac{-9}{10}.\dfrac{-13}{36}\)

\(A=\dfrac{1.\left(-6\right).\left(-9\right).\left(-13\right)}{3.13.10.36}\)

\(A=\dfrac{-1}{10.2}\)

\(A=\dfrac{-1}{20}\)

b, \(B=\dfrac{-1}{3}.\dfrac{-15}{17}.\dfrac{34}{45}\)

\(B=\dfrac{\left(-1\right).\left(-15\right).34}{3.17.45}\)

\(B=\dfrac{2}{3.3}\)

\(B=\dfrac{2}{9}\)

c, \(C=\dfrac{1}{3}.\dfrac{4}{5}+\dfrac{1}{3}.\dfrac{6}{5}+\dfrac{2}{3}\)

\(C=\dfrac{1}{3}.\left(\dfrac{4}{5}+\dfrac{6}{5}\right)+\dfrac{2}{3}\)

\(C=\dfrac{1}{3}.2+\dfrac{2}{3}\)

\(C=\dfrac{2}{3}+\dfrac{2}{3}\)

\(C=\dfrac{4}{3}\)

d, \(D=\dfrac{-5}{6}.\dfrac{4}{19}+\dfrac{-7}{12}.\dfrac{4}{19}-\dfrac{40}{57}\)

\(D=\dfrac{4}{19}.\left(\dfrac{-5}{6}+\dfrac{-7}{12}\right)-\dfrac{40}{57}\)

\(D=\dfrac{4}{19}.\dfrac{-17}{12}-\dfrac{40}{57}\)

\(D=\dfrac{-17}{57}-\dfrac{40}{57}\)

\(D=\dfrac{-57}{57}=-1\)

e, \(E=\dfrac{3}{7}.\dfrac{9}{26}-\dfrac{1}{14}.\dfrac{1}{13}-\dfrac{1}{7}\)

\(E=\dfrac{3}{7}.\dfrac{9}{26}-\left(\dfrac{1}{14}.\dfrac{1}{13}+\dfrac{1}{7}\right)\)

\(E=\dfrac{3}{7}.\dfrac{9}{26}-\left(\dfrac{1}{182}+\dfrac{1}{7}\right)\)

\(E=\dfrac{3}{7}.\dfrac{9}{26}-\dfrac{27}{182}\)

\(E=\dfrac{27}{182}-\dfrac{27}{182}\)

\(E=0\)

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