-1/2+ 2/3 - 3/4 + 4/5

trả lời:

-1/2+ 2/3 - 3/4 + 4/5

=13/60

a) 2.5³-3.2+4⁵:4³
= 2.125-6+16
= 250+10
= 260

250-6 + 4^5-3 =>250-6 + 4² =>250-6 + 16 =>260

=260

??????????????????????

= (8.125). (25.4).3³

=  1000. 100.9
= 100 000.9
= 900 000

8.4.3^3.125.25

=(8.125).(25.4).27

=1000.100.27

=2100000

\(-\frac{1}{2}+\frac{2}{3}-\frac{3}{4}+\frac{4}{5}\)

\(=\left(-\frac{1}{2}-\frac{3}{4}\right)+\left(\frac{2}{3}+\frac{4}{5}\right)\)

\(=\left(-\frac{2}{4}-\frac{3}{4}\right)+\left(\frac{10}{15}+\frac{12}{15}\right)\)

\(=\left(\frac{-2-3}{4}\right)+\left(\frac{10+12}{15}\right)\)

\(=\left(\frac{-5}{4}\right)+\left(\frac{22}{15}\right)\)

\(=\frac{-75}{60}+\frac{88}{60}\)

\(=\frac{-75+88}{60}\)

\(=\frac{13}{60}\)

Mình ghi rõ từng chi tiết rồi nha , chúc bạn học tốt !!! 

-1/2+ 2/3 - 3/4 + 4/5

= (-1/2-3/4) + (2/3+4/5)

= -5/4 + 22/15

= 13/60

6/7+(5/8-3/16):5.-4

=6/7+(10/16-3/16):5.-4

=6/7+7/16:5.-4

=6/7+7/80.-4

=6/7+-28/80

=6/7+7/20

120/140+49/140

=169/140

\(-\frac{2}{3}+\frac{1}{5}.\frac{-10}{7}\\ =-\frac{2}{3}+\frac{1.-10}{5.7}\\ =-\frac{2}{3}+\frac{-2}{7}\\ =-\frac{14}{21}+\frac{-6}{21}\\ =-\frac{20}{21}\)

=\(\frac{-2}{3}+\frac{1}{5}.\frac{-10}{7}\)

=\(\frac{-2}{3}+\frac{-2}{7}\)

=\(\frac{-20}{21}\)