400 : { 5 . [ 360 - ( 290 + 2 . 5⁵ )]}

= 400 : { 5 . [ 360 - ( 290 + 2 . 25 )]}

= 400 : { 5 . [ 360 - ( 290 + 50 )]}

= 400 : [ 5 . ( 360 - 340 )]

= 400 : ( 5 . 20 )

= 200 : 100 = 2

\(400\div\left\{5\left[360-\left(290+2.5^2\right)\right]\right\}\)

\(=400\div\left\{5\left[360-\left(290+50\right)\right]\right\}=400\div\left[5\left(360-340\right)\right]\)

\(=400\div\left(5.20\right)=400\div100=4\)

                                       Bài giải

\(400\text{ : }\left[5\left\{360-\left(290+2\cdot5^2\right)\right\}\right]\)

\(=400\text{ : }\left[5\left\{360-\left(290+50\right)\right\}\right]\)

\(=400\text{ : }\left[5\left\{360-340\right\}\right]\)

\(=400\text{ : }\left[5\cdot20\right]\)

\(=400\text{ : }100\)

\(=4\)

400 : { 5. [ 360 - ( 290 + 2.5² ) ] }

=400:{5.[360-(290+50)]}

=400:[5.(360-340)]

=400:(5.20)

=400:100

=4

TÍCH NHA

400: {5.[360-(290+2.5²)]}

=400: {5.[360-(290+2.25)]}

=400: {5.[360-(290+50)]}

=400: {5.[360-340]}

=400: {5.20}

=400:100

=4

500-{5.(409-(2³x3-21)²]-1724}

= 500-{5.(409-(8x3-21)²]-1724}

=500-{5.(409-(24-21)²]-1724}

=500-{5.(409-3²)-1724}

=500-{5.(409-9)-1724}

=500-{5.400-1724}

=500-{2000-1724}

=500-276

=224

Hok tốt!

    5 x 2³ + 7¹¹ : 7⁹ - 1²⁰¹⁸

= 5 x 8 + 49 - 1

=   40 + 48

=      88

   400 : { 5 x ( 290 + 2 x 5²)}

= 400 : { 5 x ( 290 + 2 x 25 ) }

= 400 : { 5 x ( 290 + 50)}

= 400 : { 5 x 240 }

= 400 :  1000

= 2/5

còn câu 1 ko hiểu x là tìm x hay là dấu nhân??

1: \(23+\left(-13\right)+\left(-50\right)\)

\(=23-13-50\)

=10-50

=-40

2: \(-5+15+\left(-123\right)\)

\(=\left(-5+15\right)-123\)

=10-123

=-113

3: \(5871:\left\{928-\left[\left(-82+247\right)\right]\right\}\cdot5\)

\(=5871-\left\{928+82-247\right\}\cdot5\)

\(=5871-763\cdot5=5871-3815=2056\)

4: \(40-\left(4\cdot5^2-3\cdot2^3\right)\)

\(=40-4\cdot5^2+3\cdot2^3\)

\(=40-4\cdot25+3\cdot8\)

=40-100+24

=64-100

=-36

5: \(6^2\cdot5-7^2+149\)

\(=36\cdot5-49+149\)

\(=180+149-49\)

=180+100

=280

6: \(-210:\left[16+3\cdot\left(6+3\cdot2^2\right)\right]+\left(-2022\right)\)

\(=-210:\left[16+3\cdot\left(6+3\cdot4\right)\right]+\left(-2022\right)\)

\(=-210:\left[16+3\cdot18\right]+\left(-2022\right)\)

\(=-210:70-2022\)

=-3-2022

=-2025

7: \(5\cdot2^3+7^{11}:7^9-2023^0\cdot1^8\)

\(=5\cdot8+7^2-1\)

=40+49-1

=39+49

=88

8: \(400:\left\{5\cdot\left[360-\left(290+2\cdot5^2\right)\right]\right\}\)

\(=400:\left\{5\cdot\left[360-290-2\cdot25\right]\right\}\)

\(=400:\left\{5\cdot20\right\}\)

\(=\dfrac{400}{100}=4\)

9: \(75-\left(3\cdot5^2\right)-4\cdot5^3\)

\(=75-3\cdot25-4\cdot5^3\)

=-4*125

=-500

\(5\cdot2^2+7^{11}:7^9-1^8\)

\(=20+2^2-1\)

\(=20+4-1\)

\(=23\)

\(400:\left\{5\cdot\left[360-\left(290+2\cdot5^2\right)\right]\right\}\)

\(=400:\left\{5\cdot\left[360-\left(290+50\right)\right]\right\}\)

\(=400:\left(5\cdot\left[360-340\right]\right)\)

\(=400:\left(5\cdot20\right)\)

\(=400:100\)

\(=4\)

\(-200:\left\{5\left[360-\left(290+2.5^2\right)\right]\right\}\)

\(=-200:\left\{5\left[360-\left(290+2.25\right)\right]\right\}\)

\(=-200:\left\{5\left[360-\left(290+50\right)\right]\right\}\)

\(=-200:\left\{5\left[360-340\right]\right\}\)

\(=-200:\left\{5.20\right\}\)

\(=-200:100=-2\)

-200 : {5.[360 - (290 + 2.5²)]}

= -200 : {5.[360 - (290 + 2.25)]}

= -200 : {5.[360 - (290 + 50)]}

= -200 : {5.[360 - 340]}

= -200 : {5.20}

= -200 : 100

= (-2)