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