145,8 x 4 - 53,85 + 5 x 145,8 - 46,15 + 145,8

= 145,8 x (4 + 5 + 1) - (53,85 + 46,15)

= 145,8 x 10 - 100

= 1458 - 100

= 1358

đáp án là 1358 nhé 

nhớ k cho mình nhé

8/3  nhé bn tk mk nha

=\(\frac{7.3.2.11.17.4}{11.17.7.3.3}\)=\(\frac{8}{3}\)

\(\frac{5}{11}.\frac{7}{25}+\frac{15}{11}.\frac{1}{5}\)

\(=\frac{5}{11}.\frac{7}{25}+\frac{5}{11}.3.\frac{1}{5}\)

\(=\frac{5}{11}.\frac{7}{25}+\frac{5}{11}.\frac{3}{5}\)

\(=\frac{5}{11}\left(\frac{7}{25}+\frac{3}{5}\right)\)

\(=\frac{5}{11}\left(\frac{7}{25}+\frac{15}{25}\right)\)

\(=\frac{5}{11}.\frac{22}{25}=\frac{2}{5}\)

2/5 nhé

   5/11x7/25+15/11x1/5

=5/11x(7/25+1/5)

=5/11x12/25

=12/55

Chúc bn hok tốt

các bn nào đang online giải hộ mk vs

a)\(\frac{21}{11}.\frac{22}{17}.\frac{68}{63}=\frac{21.22.68}{11.17.63}=\frac{21.2.11.4.17}{11.17.3.21}=\frac{\left(11.17.21\right)2.4}{\left(11.17.21\right).3}=\frac{2.4}{3}=\frac{8}{3}\)

b)\(\frac{5}{14}.\frac{7}{13}.\frac{26}{25}=\frac{5.7.26}{14.13.25}=\frac{5.7.13.2}{7.2.13.5.5}=\frac{\left(5.7.13\right).2}{\left(5.7.13\right).2.5}=\frac{2}{2.5}=\frac{1}{5}\)

ai nhanh mình tick nha!!!!!!!!

 8888 x 85 + 8888 x 10 + 8888 x 6 – 8888 

= 8888 x ( 85 + 10 + 6 - 1 )

= 8888 x 100

= 888800

=8888 x (85+10+6-1)

=8888 x 100

=888800

( 4 . 3¹⁵ + 5 . 3¹⁵ ) : 3¹⁶

=  3¹⁵.( 4 + 5)  : 3¹⁶

= 3¹⁵.3²:3¹⁶

= 3¹=3

\(=\left[3^{15}\left(4+5\right)\right]:3^{16}=\left(3^{15}.3^2\right):3^{16}=3^{17}:3^{16}=3\)

\(=\frac{3^{15}\cdot\left(4+5\right)}{3^{16}}=3\)

\(=46\left(17+38+1+44\right)\)

\(=4600\)