các bạn giải giúp mình nhé

\(=\dfrac{1}{11}-\dfrac{1}{11}+\dfrac{1}{41152}=\dfrac{1}{41152}\)

a) 4x^2 ( 5x^3 - 2x + 3 )

= 20x^5 - 8x^3 + 12x^2

b) ( 2x + 5 ) ( 3x - 2 )

= 6x^2 - 4x + 15x - 10

= 6x^2 + 11x - 10

c) ( 5x + y )^2

= ( 5x )^2 + 2 . 5x . y + y^2

= 24x^2 + 10xy + y^2

Bài 1: 

a) 4√24 - 3√54 + 5√6 - √150

= 8√6 - 9√6 + 5√6 - 5√6

= -√6

a: \(=4\cdot2\sqrt{6}-3\cdot3\sqrt{6}+5\sqrt{6}-5\sqrt{6}\)

\(=8\sqrt{6}-9\sqrt{6}=-\sqrt{6}\)

b: \(=2\left(3-2\sqrt{2}\right)-2\left(3+2\sqrt{2}\right)\)

\(=6-4\sqrt{2}-6-4\sqrt{2}=-8\sqrt{2}\)

c: \(=\sqrt{3-\sqrt{5}}-\sqrt{3+\sqrt{5}}\)

\(=\dfrac{\sqrt{6-2\sqrt{5}}-\sqrt{6+2\sqrt{5}}}{\sqrt{2}}\)

\(=\dfrac{\sqrt{5}-1-\sqrt{5}-1}{\sqrt{2}}=-\dfrac{2}{\sqrt{2}}=-\sqrt{2}\)

A. 122

B.256

C.23

e: \(=128-\left[68+8\cdot4\right]:4=128-25=103\)

\(a.3.5^2+15.2^2-26:2\)                     \(b.5^3.2-100:4+2^3.5\)

\(=75+60-13\)                                  \(=250-25+40\)   

\(=135+13=148\)                                \(=265\)

\(c.6^2:9+50.2-3^3.3\)                \(d.2345-1000:\left[19-2.\left(21-18\right)^2\right]\)

\(=4+100-81\)                            \(=2345-1000:\left[19-2.3^2\right]\)

\(=23\)                                            \(=2345-1000:\left[19-18\right]\)

                                                    \(=2345-1000:1\)

                                                    \(=2345-1000=1345\)

\(e.128-\left[68+8.\left(37-35\right)^2\right]:4\)               

\(=128-\left[68+8.2^2\right]:4\)

\(=128-\left[68+32\right]:4\)

\(=128-100:4\)

\(=128-25=103\)

\(f.568-\left\{5.\left[143-\left(4-1\right)^2\right]+10\right\}:10\)

\(=568-\left\{5.\left[143-3^2\right]+10\right\}:10\)

\(=568-\left\{5.134+10\right\}:10\)

\(=568-\left\{670+10\right\}:10\)

\(=568-680:10\)

\(=568-68=500\)

`a)3/5+13/5-5/9-3/7`

`=16/5-5/9-3/7`

`=698/315`

3/5 + 13 /5 -5/9 - 3/7 = 698/315

\(\dfrac{3}{5}+\dfrac{13}{25}-\dfrac{5}{9}-\dfrac{3}{7}\)

\(=\dfrac{15}{25}+\dfrac{13}{25}-\dfrac{35}{63}-\dfrac{27}{63}\)

\(=\dfrac{28}{25}-\dfrac{62}{63}=\dfrac{214}{1575}\)

bằng 214/1575

\(a,\left\{\left[\left(37+13\right):5\right]-45:5\right\}.7\)

\(=\left\{\left[50:5\right]-45:5\right\}.7\)

\(=\left\{10-45:5\right\}.7\)

\(=\left\{10-9\right\}.7\)

\(=1.7=7\)

\(6^2.10:\left\{780:\left[10^3-\left(2.5^3+35.14\right)\right]\right\}\)

\(=36.10:\left\{780:\left[1000-\left(2.125+35.14\right)\right]\right\}\)

\(=360:\left\{780:\left[1000-\left(250+490\right)\right]\right\}\)

\(=360:\left\{780:\left[1000-740\right]\right\}\)

\(=360:\left\{780:260\right\}\)

\(=360:3=120\)

f: =20:4+5

=5+5

=10

e: =125-100=25

tự tính

a) \(2xy\left(3x^2-5xy+4y^2\right)=6x^3y-10x^2y^2+8xy^3\)

b) \(\left(x-3\right)^2+\left(x+5\right)\left(5-x\right)=x^2-6x+9+25-x^2=34-6x\)

a: \(2xy\left(3x^2-5xy+4y^2\right)=6x^3y-10x^2y^2+8xy^3\)

b: \(\left(x-3\right)^2+\left(x+5\right)\left(5-x\right)\)

\(=x^2-6x+9+25-x^2\)

=-6x+34