(ko bt đúng sai đâu nhá!)

2)

200 : [ 117 -( 23-2.3 ) ]

= 200:[117-(23-6)]

= 200:[117-17]

= 200:100

= 2

4)

2020-[45-(6-1)² ] + 1992⁰

= 2020 - [45-5² ] + 1992⁰

= 2020 - 40² + 1

= 2020 - 1600 + 1

= 420 +1

= 421

6)

480 : [75 + (7² - 8.3) : 5 ] + 2021⁰ 

= 480 : [ 75+( 49 - 24 ): 5 ] + 2021⁰

= 480: [ 75 + 25 : 5 ] + 2021⁰

= 480 : [ 75 + 5 ] + 2021⁰

= 480 : 80 + 1 

= 6 + 1

= 7

8)

2⁴ . 5 - [ 131 - (13 - 4)² ]

= 10⁴ - [ 131 - 9² ]

= 10⁴ - 50

= 10000 - 50

= 9950

(1992⁰ = 1 : 2021⁰=1)

\(\left(-3\right)^2.\left(-5\right)-\left[\left(-95\right)+\left(13+7\right)^2\right]\)

\(=9.\left(-5\right)-\left(-95+20^2\right)\)

\(=-45+95-400\)

\(=50-400\)

\(=-350\)

          \(\frac{5}{9}.\frac{-4}{17}+\frac{-13}{17}.\frac{5}{9}+2\frac{4}{9}\)

\(=\)\(\frac{5}{9}.\left(\frac{-4}{17}+\frac{-13}{17}\right)+2\frac{4}{9}\)

\(=\frac{5}{9}.\left(-1\right)+\frac{22}{9}\)

\(=\frac{5}{9}+\frac{22}{9}\)

\(=3\)

hộ mik vs

Đáp số là 26461,26922 em nhé

bạn có thể vt rõ câu hỏi ra đc ko

 (x²y-2xy+2y)(x-2y)  = x³y-2x²y²-2x²y+4xy²+2xy-4y²

Đặt A = 1 + ( - 2 ) + ( - 3 ) + 4 + 5 + ( - 6 ) + ( - 7 ) + 8 + ... + 99 - 100 - 101 - 102 + 103

=> A = [ 1 + ( - 2 ) + ( - 3 ) + 4 ] + [ 5 + ( - 6 ) + ( - 7 ) + 8 ] + .... + [ 99 - 100 - 101 + 102 ] + 103

=> A = 0 + 0 + 0 + .... + 103

=> A = 103

Vậy A = 103

làm bừa cho rồi