Matematică, întrebare adresată de Utilizator anonim, 8 ani în urmă

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Anexe:

Răspunsuri la întrebare

Răspuns de zaldoiuclaudia
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Răspuns:

5) a)|×|=4=)×=4;-4

b)|×|=18=)×=18;-18

c)|×|=0=)×=0

d)|3×-2|=1

3×-2=1

3×=3/:3

×=1

e)|×|=-1=)×=1;-1

f)|×-3|=0

×-3=0/+3

×=3

g)|×-4|=2

×-4=2/+4

×=6

h)|×-5|=1

×-5=1/+5

×=6

i)|×+2|=11

×+2=11/-2

×=9

j)|2×|=8

2×=8/:2

×=4

k)|×+3|=1

×+3=1/-3

×=-2

l)|×+7|=9

×+7=9/-7

×=2

m)|3×|=27

3×=27/:3

×=9

n)|2×+1|=5

2×+1=5/-1

2×=4/:2

×=2

o)|-×|=7

×=7

6) a) 3x+8=2/-8

3×=-6/:3

×=-2

b)4×-16=-20/+16

4×=-4/:4

×=-1

c)18-5×=23/-18

-5×=5/:(-5)

×=-1

d)4•(5-×)=24

20-4×=24/-20

-4×=4/:(-4)

x=-1

e)4•(5-×)=-24

20-4×=-24/-20

-4×=-44

×=11

f)5-8×=-27/-5

-8×=-32

×=4

g)2•(×-3)-8=-18

2×-6-8=-18

2×-14=-18/+14

2×=-4/:2

×=-2

h)2•(1-×)=-10

2-2×=-10/+2

-2×=-8

×=4

i)-8-9×=19/+8

-9×=27

×=-3

j)-8=4+3•(×+2)

-8=4+3×+6

-8=10+3×

-3x=10+8

-3×=18

×=-6

k)4+10×=-16/-4

10×=-20

×=-2

l)3×-4•[-5+(-2)2]=1

3×-4•(-5+4)=1

3×+20-16=1

3×+4=1/-4

3×=-3

×=-1

m)×+16-30=-5

×-24=-5/+24

×=19

n)×+(-5+1)-6=-(-7)-1

×-4-6=+7-1

×-10=6/+10

×=16

o)-(2-3)+×=21

1+×=21/-1

×=20

p)×+(-6)-(-7)=-[-2-(3-1)]

×-6+7=-(-2-2)

×-1=4/+1

×=5

r)×-(6-2•2)=0

×-(6-4)=0

×-2=0/+2

×=2

s)-2-(4-3)-(3-4)+×=-(3•3-3-3)

-2-1+1+×=-(9-3-3)

-2+×=-3/+2

×=-1

7)a)×-|-6|=3+|-8|

×-6=3+8

×-6=11/+6

×=17

b)×+|2-6|=4•4-|-2|

×+|-4|=4•4-2

×+4=16-2

×+4=14/-4

×=10

c)|3•3-6-2•2|+×=6•6:3•3-5

|9-6-4|+×=36:9-5

1+×=4-5

1+×=-1/-1

×=-2

d)2•|3-4|+×=|6-12|:3

2•1+×=6:3

2+×=2/-2

×=0

e)|-8+(-8)|:|-2|+×=4

16:2+×=4

8+×=4/-8

×=-4

f)[-(4-6)]•(3•3•3:9)+×=-(2•5-6)

2•(27:9)+×=-4

2•3+×=-4

6+×=-4/-6

×=-10

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