Վարժ․ 261

ա1) x3+4x2+x+6/x+1

x3+4x2+x+6/x+1=x2+3x-2 (8)

x3+4x2+x+6=(x+1)(x2+3x-2)+8

ա2) x3+4x2+x+6/x-2

x3+4x2+x+6/x-2=x2+6x+13 (32)

x3+4x2+x+6=(x-2)(x2+6x+13)+32

ա3) x3+4x2+x+6/x-3

x3+4x2+x+6/x-3=x2+7x+2 (72)

x3+4x2+x+6=(x-3)(x2+7x+22)+72

բ1) x4+2x3+x2+6/x2+x+1

x4+2x3+x2+6/x2+x+1=x2+x+6 (7)

x4+2x3+x2+6=(x2+x+1)(x2+x+6)+7

բ2) x4+2x3+x2+6/x+2

x4+2x3+x2+6/x+2=x3+x-2 (10)

x4+2x3+x2+6=(x+2)(x3+x-2)+10

գ1) x5-1/x4+1

x5-1/x4+1=x (x-1)

x5-1=(x4+1)x+x-1

գ2) x5-1/x3-1

x5-1/x3-1=x2 (x^2-1)

x5-1=(x3-1)*(x2)+x2-1

գ3) x5-1/x4+x3+x2+x+1

x5-1/x4+x3+x2+x+1=x-1

x5-1=(x4+x3+x2+x+1)(x-1)

Վարժ․ 262

ա) x12-1=(x4-1)*A

x12-1/x4-1=A

x12-1/x4-1=x8+x4+1

x12-1=(x4-1)(x8+x4+1)

A=x8+x4+1

բ) x12-1=(x2+1)*A

x12-1/x2+1=A

x12-1/x2+1=x10-x8+x6-x4+x2-1

x12-1=(x2+1)(x10-x8+x6-x4+x2-1)

A=x10-x8+x6-x4+x2-1

գ) x12-1=(x2-1)*A

x12-1/x2-1=A

x12-1/x2-1=x10+x8+x6+x4+x2+1

x12-1=(x2+1)(x10+x8+x6+x4+x2+1)

A=x10+x8+x6+x4+x2+1

դ) x12-1=(x+1)*A

x12-1/x+1=A

x12-1/x+1=x11-x10+x9-x8+x7-x6+x5-x4+x3-x2+x-1

x12-1=(x+1)(x11-x10+x9-x8+x7-x6+x5-x4+x3-x2+x-1)

A=x11-x10+x9-x8+x7-x6+x5-x4+x3-x2+x-1

ե) x12-1=(x-1)*A

x12-1/x-1=A

x12-1/x-1=x11+x10+x9+x8+x7+x6+x5+x4+x3+x2+x+1

x12-1=(x-1)(x11+x10+x9+x8+x7+x6+x5+x4+x3+x2+x+1)

A=x11+x10+x9+x8+x7+x6+x5+x4+x3+x2+x+1

զ) x5-32=(x-2)*A

x5-32/x-2=A

x5-32/x-2=x4+2x3+4x2+8x+16

x5-32=(x-2)(x4+2x3+4x2+8x+16)

A=x4+2x3+4x2+8x+16

է) x6-64=(x-2)*A

x6-64/x-2=A

x6-64/x-2=x5+2x4+4x3+8x2+16x+32

x6-64=(x-2)(x5+2x4+4x3+8x2+16x+32)

A=x5+2x4+4x3+8x2+16x+32

ը) x7-128=(x-2)*A

x7-128/x-2=A

x7-128/x-2=x6+2x5+4x4+8x3+16x2+32x+64

x7-128=(x-2)(x6+2x5+4x4+8x3+16x2+32x+64)

A=x6+2x5+4x4+8x3+16x2+32x+64

Վարժ․ 263

ա) 5n+7/n

5n+7/n=5 (7)

5n+7/n=(5n/n)+(7/n)=5+(7/n)=> [ n=1; 7

Պատ՝․ n=1; n=7

բ) 5n+7/n+2

5n+7/n+2=5 (-3)

5n+7/n+2=5n+10-3/n+2=(5n+10/n+2)-(3/n+2)=5-(3/n+2)=> [ n+2=1; n+2=3=> [ n= -1; n=1

Պատ՝․ n= -1; n=1

գ) 3n2-6n+1/n-2

3n2-6n+1/n-2=3n-12 (-23)

3n2-6n+1/n-2=3n2-6n-23/n-2=(3n2-6n/n-2)-(23/n-2)=3n2-6n-(23/n-2)=> [ n-2=1; n-2=23=> [ n= 3; n=25

Պատ՝․ n=3; n=25

դ) 7n+5/n

7n+5/n=7 (5)

7n+5/n=(7n/n)+(5/n)=7+(5/n)=> [ n=1; n=5

Պատ՝․ n=1; n=5

ե) 7n+5/n+1

7n+5/n+1=7 (-2)

7n+5/n+1=7n+7-2/n+1=(7n+7/n+1)-(2/n+1)=7-(2/n+1)=> [ n+1=2; n+1=1=> [ n=1; n=0

Պատ՝․ n=1; n=0

զ) 2n2-6n+7/n-3

2n2-6n+7/n-3=2n-12 (-29)

2n2-6n+7/n-3=2n2-6n-29/n-3=(2n2-6n/n-3)-(29/n-3)=2n2-6n-(29/n-3)=> [ n-3=1; n-3+29=> [ n=4; n=32

Պատ՝․ n=4; n=32