=5x(2+4+6+8)
=5x20
=100

nguyễn thị yến vy            

2x5+4x5+6x5+8x5

= 10 + 20 + 30 + 40

= 100

2*5+4*5+6*5+8*5

= (2+4+6+8)*5

=[(2+8)+(4+6)]*5

=(10+10)*5

=20*5

=100

Mọi người giúp mình nha!Mình chỉ tick cho câu trả lời đầu tiên hoi!

159.54+159.46

=159. (54+46) 

=159. 100

=15900

12.5+3.12

=12. (5+3) 

=12.8

=96

2.5+4.5+6.5+8.5

=5. (2+4+6+8) 

=5. 20

=100

Cmt đầu nha bn

159.54+159.46

=159. (54+46) 

=159. 100

=15900

12.5+3.12 =12. (5+3)  =12.8 =96

2.5+4.5+6.5+8.5 =5. (2+4+6+8)  =5. 20 =100

a, \(P\left(x\right)=5x^5-4x^2+7x+1;Q\left(x\right)=5x^5-4x^2+3x+8\)

b, \(P\left(x\right)+Q\left(x\right)=10x^5-8x^2+10x+9\)

c, \(P\left(x\right)=Q\left(x\right)\Rightarrow7x+1=3x+8\Leftrightarrow4x=7\Leftrightarrow x=\dfrac{7}{4}\)

a/ \(P\left(x\right)=8x^5+7x-6x^2-3x^5+2x^2+1\)

\(=8x^5-3x^5-6x^2+2x^2+7x+1\)

\(=5x^5-4x^2+7x+1\)

\(Q\left(x\right)=4x^5+3x-2x^2+x^5-2x^2+8\)

\(=4x^5+x^5-2x^2-2x^2+3x+8\)

\(=5x^5-4x^2+3x+8\)

b/ \(P\left(x\right)=5x^5-4x^2+7x+1\)

+  \(Q\left(x\right)=5x^5-4x^2+3x+8\)

____________________________

\(P\left(x\right)+Q\left(x\right)=10x^5-8x^2+10x+9\)

c/ \(P\left(x\right)=Q\left(x\right)\)

\(\Rightarrow5x^5-4x^2+7x+1=5x^5-4x^2+3x+8\)

\(\Rightarrow7x+1=3x+8\)

\(\Rightarrow4x-7=0\)

\(\Rightarrow x=\dfrac{7}{4}\)

a) P(x) = 5x⁵ - 4x² + 7x + 15

Q(x) = 5x⁵ - 4x² + 3x + 8

b) Có: P(x) - Q(x) = 4x + 7

P(x) - Q(x) = 0 <=> x = \(-\dfrac{-7}{4}\)

`a,```P(x) = 8x^5 +7x -6x^2 -3x^5 +2x^2+15`

`= (8x^5 -3x^5 ) +(-6x^2+2x^2) +7x+15`

`=5x^5 -4x^2 +7x+15`

`Q(x) =4x^5 +3x-2x^2 +x^5 -2x^2+8`

`=(4x^5+x^5) +(-2x^2  -2x^2)+3x+8`

`= 5x^5 - 4x^2 +3x+8`

`b, P(x) -Q(x)=(5x^5 -4x^2 +7x+15)-(5x^5 - 4x^2 +3x+8)`

`= 5x^5 -4x^2 +7x+15-5x^5 +4x^2 -3x-8`

`= (5x^5-5x^5)+(-4x^2+4x^2) +(7x-3x)+(15-8)`

`= 0 + 0 +4x + 7`

`=4x+7`

=42x(3+5+5-2)

=42x11

=462

\(\dfrac{10^9\cdot81^{10}}{8^4\cdot25^3\cdot9^{10}}=\dfrac{2^9\cdot5^9\cdot3^{40}}{2^{12}\cdot5^6\cdot3^{20}}=\dfrac{5^3\cdot3^{20}}{2^3}\)

   62 + 42 \(\times\) 5 - 625 : 25 

= 62 + 210 - 25

= 272 - 25

= 247

247

\(62+42\times5-625:25\\ =62+210-25\\ =247\)

j vậy

vừa hỏi vừa trả lời là sao

= 9 x 25 - 4 x 25 - 25 x 5

= 25 x ( 9 - 4 - 5 )

= 25 x 0

= 0

= 9 x 25 - 4 x 25 - 25 x 5

= 25 x ( 9 - 4 - 5 )

= 25 x 0

= 0

Học tốt

225-4x25-25x5

25x9-4x25-25x5

25(9-4-5)

25x0

0