Ta có: x=100

nên x+1=101

Ta có: \(f\left(x\right)=x^8-101x^7+101x^6-101x^5+...+101x^2-101x+25\)

\(=x^8-x^7\left(x+1\right)+x^6\left(x+1\right)-x^5\left(x+1\right)+...+x^2\left(x+1\right)-x\left(x+1\right)+25\)

\(=x^8-x^7-x^7+x^7+x^6-x^6-x^5+x^5-x^4+...+x^3+x^2-x^2-x+25\)

\(=-x+25\)

\(=-100+25=-75\)

ý là thế này hả bn?

(R1ntR2)//(R3ntR4)

a,\(=>Rtd=\dfrac{\left(R1+R2\right)\left(R3+R4\right)}{R1+R2+R3+R4}=\dfrac{\left(10+15\right)\left(10+25\right)}{10+15+10+25}=\dfrac{175}{12}\left(om\right)\)

b,\(=>U12=U34=36V\)

\(=>I12=I1=I2=\dfrac{U12}{R12}=\dfrac{36}{10+15}=1,44A\)

\(=>I34=I3=I4=\dfrac{U34}{R34}=\dfrac{36}{10+25}=\dfrac{36}{35}A\)

A= (-50)(2-120+120)=(-50)(2)=-100

214 + [ 120 - ( 214 +120)]

=214 + [ 120 - 334 ]

= 214 + ( - 214 )

=0

thử nhiệm 

tính nhanh:

214 + [ 120 - ( 214 +120)]

=214 +  120 - ( 214 +120)

=214 +  120 - 214 -120

=214 - 214 +  120 -120

=0

=214 + [ 120 - 334]

= 214 + (- 106 )

=  8

214 + [120 - (214 + 120)]

= 214 + 120 - (214 + 120

= 214 + 120 - 214 - 120

= (214 - 214) + (120 - 120)

= 0 + 0

= 0 

214 +[120-(214+120)]

=214+120-214-120

=(214 -214)+(120-120)

=0+0

= 0

214+120-214-120

=(-214)+214+ (-120)+120

=     0         +      0

=                 0

a) 214+[120-(210+120)]=214+[120-334]=214+(-214)=0

b)(-321)-[(-321+35)-235]=(-321)-[(-286)-235]=(-321)-(-521)=200

xong rồi đó nhớ **** mình theo đúng lời hứa nha

120 x 89 + 120 x 49 - 120 x 38 

= 120 x [ 89 + 49 - 38 ]

= 120 x 100

= 12000

  120 x 89 + 120 x 49 - 123 x 39

= 120 x ( 89 + 49 - 38 )

= 120 x 100

= 12000

= 12000

k mik nha !

kb vs mik nhé !