`(5^(16) +16^5)(3^(17)-3^(10))(2^4-4^2)`

`=(5^(16)+16^5)(3^(17)-3^(10))(16-16)`

`=(5^(16)+16^5)(3^(17)-3^(10))0`

`=0`

\(\left(5^{16}+16^5\right)\left(3^{17}-3^{10}\right)\left(2^4-4^2\right)\)

\(=\)\(\left(5^{16}+16^5\right)\left(3^{17-7}\right)\left(16-16\right)\)

\(=\left(5^{16}+16^5\right).3^7.0\)

\(=0\).

(5¹⁶ + 16⁵) (3¹⁷-3¹⁰) (2⁴- 4²)

= 0

a)\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+...+\frac{1}{98.99}+\frac{1}{99.100}\)

\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+...+\frac{1}{99}-\frac{1}{100}\)

\(=1-\frac{1}{100}\)

\(=\frac{99}{100}\)

b)\(\frac{5}{11.16}+\frac{5}{16.21}+...+\frac{5}{61.66}\)

\(=\frac{1}{11}-\frac{1}{16}+\frac{1}{16}-\frac{1}{21}+....+\frac{1}{61}-\frac{1}{66}\)

\(=\frac{1}{11}-\frac{1}{66}\)

\(=\frac{5}{66}\)

a,\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{98.99}+\frac{1}{99.100}\)

ta có:

\(\frac{1}{1.2}=\frac{2-1}{1.2}=\frac{2}{1.2}-\frac{1}{1.2}=1-\frac{1}{2}\)

\(\frac{1}{2.3}=\frac{3-2}{2.3}=\frac{3}{2.3}-\frac{2}{2.3}=\frac{1}{2}-\frac{1}{3}\)

...

\(\frac{1}{99.100}=\frac{1}{99}-\frac{1}{100}\)

= \(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{99}-\frac{1}{100}\)

=\(1-\frac{1}{100}=\frac{99}{100}\)

b,

\(\frac{5}{11.16}+\frac{5}{16.21}+\frac{5}{21.16}+...+\frac{5}{61.66}\)

ta có:

\(\frac{5}{11.16}=\frac{16-11}{11.16}=\frac{16}{11.16}-\frac{11}{11.16}=\frac{1}{11}-\frac{1}{16}\)

\(\frac{5}{16.21}=\frac{21-16}{16.21}=\frac{21}{16.21}-\frac{16}{16.21}=\frac{1}{16}-\frac{1}{21}\)

...

\(\frac{5}{61.66}=\frac{66-61}{61.66}=\frac{66}{61.66}-\frac{61}{61.66}=\frac{1}{61}-\frac{1}{66}\)

= \(\frac{1}{11}-\frac{1}{16}+\frac{1}{16}-\frac{1}{21}+...+\frac{1}{61}-\frac{1}{66}\)

=\(\frac{1}{11}-\frac{1}{66}\)=\(\frac{5}{66}\)

Bằng 4.751383735

Hì mk làm bừa thui 

Chúc bạn học tốt nha 😊

Đ/S= 4,765298392

chúc bạn hk tốt nha!!!

DS=4.765298392

a: \(2\cdot25\cdot4\cdot50\)

\(=\left(2\cdot50\right)\cdot\left(25\cdot4\right)\)

\(=100\cdot100=10000\)

b: \(\left(-125\right)\cdot5\cdot\left(-16\right)\cdot\left(-8\right)\)

\(=-125\cdot5\cdot16\cdot8\)

\(=-\left(125\cdot8\right)\cdot\left(5\cdot16\right)\)

\(=-80\cdot1000=-80000\)

c: \(5^2\cdot3^3\cdot2\)

\(=25\cdot27\cdot2\)

\(=\left(25\cdot2\right)\cdot27=27\cdot50=1350\)

d: \(\left(-4\right)\cdot3^2\left(-5\right)^3\)

\(=\left(-4\right)\cdot\left(-125\right)\cdot9\)

\(=500\cdot9=4500\)

a) 

=10000

b) 

=−80000

c) 

=27⋅50

=1350

d) 

=4500

Bạn dùng công thức này mà làm nhé :\(\frac{n}{a\times\left(a+n\right)}=\frac{1}{a}-\frac{1}{a+n}\)

Ví dụ :\(\frac{2}{3\times5}=\frac{1}{3}-\frac{1}{5};\frac{3}{4\times7}=\frac{1}{4}-\frac{1}{7};\frac{5}{6\times11}=\frac{1}{6}-\frac{1}{11}\)

a) \(\frac{-3}{16}+\frac{-7}{16}+\frac{6}{-16}\)

\(=-\frac{3}{16}+-\frac{7}{16}+\frac{-6}{16}\)

\(=\frac{\left(-3\right)+\left(-7\right)+\left(-6\right)}{16}\)

\(=\frac{-16}{16}=-1\)

b) \(\frac{2}{5}-\frac{1}{7}+\frac{7}{10}\)

\(=\frac{28}{70}-\frac{10}{70}+\frac{49}{70}\)

\(=\frac{28-10+49}{70}\)

\(=\frac{67}{70}\)

c) \(3+\frac{1}{3}-2\frac{1}{2}\)

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

\(=\frac{18}{6}+\frac{2}{6}-\frac{15}{6}\)

\(=\frac{18+2-15}{6}\)

\(=\frac{5}{6}\)

d) \(-\frac{3}{5}-\left(-\frac{2}{15}\right)\)

\(=-\frac{3}{5}+\frac{2}{15}\)

\(=\frac{-9}{15}+\frac{2}{15}\)

\(=-\frac{7}{15}\)

\(\frac{-3}{16}\)+(\(\frac{-7}{16}\) ) +(\(\frac{6}{-16}\))

=\(\frac{-3-7-6}{16}\)

=\(\frac{-16}{16}\)= \(-1\)

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

=\(\frac{9}{35}\)+\(\frac{7}{10}\)

=\(\frac{67}{70}\)

3+ \(\frac{1}{3}\)\(-\) \(\frac{21}{2}\)

=\(\frac{18+2-63}{6}\)

=\(\frac{-43}{6}\)

\(\frac{-3}{5}\)\(-\)(\(\frac{-2}{15}\))

=\(\frac{-3}{5}\)+\(\frac{2}{15}\)

=\(\frac{-9+2}{15}\)

=\(\frac{-7}{15}\)

24 . ( 16 - 5 ) - 16 . ( 24 - 5 )

= 24 . 16 - 24 . 5 - 16 . 24 - 16 . 5

= -24 . 5 - 16 . 5

= -40 . 5

= -200

24 . ( 16 - 5 ) - 16 . ( 24 - 5 )

= 24 . 16 - 24 . 5 - 16 . 24 - 16 . 5

= 24 . ( 16 - 5 ) - 16 . ( 24 - 5 )

= 24 . 11 - 16 . 21

= ( 24 - 16 ) . ( 11 - 21 )

= 8 . - 10

= - 80

24 . ( 16 - 5 ) - 16 . ( 24 - 5 )

= 24 . 16 - 24 . 5 - 16 . 24 + 16 .5

= 24 . ( 16 - 16) - 5 ( 24 -16 )

= 24 .      0       -  5 .   8

=     0              -      40

=         - 40

mik học lớp 5

Ta có : B=(1/5-1/5)-(3/7-3/7)+(5/9-5/9)-(2/11-2/11)+(7/13-7/13)-9/16

B=-9/16

a) 1/1 x 2 + 1/2 x 3 + 1/3 X 4 = 29/6

b) 5/11 x 16 + 5/16 x 21 + 5/21 x 26 = 74015/3696

c) 1/20 +1/30 + 1/42 = 3/28

nho k minh nha