a. $\dfrac{14}{15}+\dfrac{2}{11}+\dfrac{1}{15}+\dfrac{4}{11}+\dfrac{10}{22}$

$=(\dfrac{14}{15}+dfrac{1}{15})+(\dfrac{2}{11}+\dfrac{4}{11}+\dfrac{10}{22})$

$=1+1=2$

b. $74\times43-43+27\times43$

$=(74-1+27)\times43$

$=100\times43=4300$

\(a)\dfrac{14}{15}+\dfrac{2}{11}+\dfrac{1}{15}+\dfrac{4}{11}+\dfrac{10}{22}\)

\(=\left(\dfrac{14}{15}+\dfrac{1}{15}\right)+\dfrac{2}{11}+\dfrac{4}{11}+\dfrac{5}{11}\)

\(=1+1=2\)

\(b)74\times43-43+27\times43\)

\(=43\times\left(74-1+27\right)\)

\(=43\times100=4300\)

a) \(\dfrac{14}{15}+\dfrac{2}{11}+\dfrac{1}{15}+\dfrac{4}{11}+\dfrac{10}{22}\)

= \(\left(\dfrac{14}{15}+\dfrac{1}{15}\right)+\left(\dfrac{2}{11}+\dfrac{4}{11}\right)+\dfrac{5}{11}\)

= \(1+\dfrac{6}{11}+\dfrac{5}{11}\)

= 2

b) 74 x 43 - 43 + 27 x 43

= 74 x 43 - 43 x 1 + 27 x 43

= 43 x ( 74 - 1 + 27 )

= 43 x 100

= 4300

43 x 95 + 5 x 43

                 = 43 x (95 + 5)

                 = 43 x 100 = 4300

43 x 95 + 5 x 43 = 43 x (95 + 5)

                           = 43 x 100 = 4300

43 x 95 + 5 x 43

= 43 x (95 + 5)

= 43 x 100 = 4300

bằng 4300

b. 43 x 95 + 5 x 43

= 43 x (95 + 5)

= 43 x 100 = 4300

a.     2 x 134 x 5 = (2 x 5) x 134

                   = 10 x 134

                   = 1340

b. 43 x 95 + 5 x 43

= 43 x (95 + 5)

= 43 x 100 = 4300

19.9+9.(37+43)+9

=19.9+9.80+9

=9.(19+80+1)

=9.100

=900

`#Ya`

`= 19 × 9 + 9 × 80 + 9 × 1`

`= 9 × ( 19 + 80 + 1 )`

`= 9 × 100= 900`

`19xx9+9xx(37+43)+9`

`=9xx(19+37+43+1)`

`=9xx100=900`

43x18-43x8

=43x(18-8)

=43x10

=430

43 x 18 - 43 x 8

= 43 x ( 18 - 8 )

= 43 x 10

= 430

43 x 18 - 43 x 8 = 43 x ( 18 - 8 ) = 43 x 10 = 430