Bạn ơi bạn làm đc bao nhiêu thì làm phụ mình nhé 

bài1

a, 

5 - 7 + 3 +(-8)

= -2 + 3 + ( - 8)

=     1    + (-8)= -7

a; - (-5) - (+7) + (+3) + (-8)

  = 5 - 7 + 3  - 8

= (5 + 3 - 8) - 7

= (8 - 8) - 7

= 0 - 7

= - 7

\(\frac{13}{15}-\left(1321+x\right)\cdot\frac{7}{12}=\frac{7}{10}\)

<=>\(\frac{13}{15}-\frac{9247}{12}-\frac{7}{12}x=\frac{7}{10}\)

<=>\(-\frac{7}{12}x=\frac{7}{10}-\frac{13}{15}+\frac{9247}{12}\)

<=>\(-\frac{7}{12}x=\frac{9245}{12}\)

<=>\(x=-\frac{7927}{6}\)

1. -x+20 = -(-15)-8+13

=> -x=15-8+13-20

=> -x=0

=> x=0

2. -(-10)+x=-13+(-9)+(-6)

=> 10+x=-13-9-6

=> x = -13-9-6-10

=> x = -38

3. 8-(-12)+10=-(-14)-x

=> 8+12+10=14-x

=> x = 14-8-12-10

=> x = -16

4. -(+12)+(-x)-(-3)=5-(-7)

=> -12-x+3=5+7

=> -x=5+7+12-3

=> -x=21

=> x=-21

5. 14-x+(-10)=-(-9)+(+15)

=> 14-x-10=9+15

=> -x=9+15-14+10

=> -x=20

=> x=-20

6. 12-(-17)+(-3)=-5+x

=> 12+17-3+5=x

=> x=31

7. x-(-19)-(+32)=14-(+16)

=> x+19-32=14-16

=> x=14-16+32-19

=> x=11

8. x-|-15|-|7|=-(-9)+|-5|

=> x-15-7=9+5

=> x=9+5+7+15

=> x=36

9. 15-x+17=13-(-21)

=> 15-x+17=13+21

=> -x=13+21-15-17

=> -x=2

=> x=-2

10. -|-5|-(-x)+4=3-(-25)

=> -5+x+4=3+25

=> x=3+25-4+5

=> x=29

\(a,12-\left(4+105-13\right)+\left(4+105-3\right)\)

\(=12-4-105+13+4+105-3\)

\(=12+\left(-4+4\right)+\left(-105+105\right)+\left(13-3\right)\)

\(=12+0+0+10\)

\(=22\)

\(b,-15+\left(-17+21-35\right)+\left(4+105-13\right)\)

\(=-15-17+21-35+4+105-13\)

\(=\left(-15-35\right)+\left(-17-13\right)+\left(21+4+105\right)\)

\(=-50-30+130\)

\(=-50+100\)

\(=50\)

\(c,\left(\left|-5\right|+\left|+7\right|+\left|-9\right|\right)-\left(\left|+5\right|+\left|-7\right|+9\right)\)

\(=\left(5+7+9\right)-\left(5+7+9\right)\)

\(=0\)

13/15 - (13/21  + x) . 7/12 = 7/10

=> (13/21 + x). 7/12 = 13/15 - 7/10

=> (13/21 + x) . 7/12 = 1/6

=> 13/21 + x = 1/6 : 7/12

=> 13/21 + x = 2/7

=> x = 2/7 - 13/21

=> x = -1/3

a, -(-5)-(+7)+(+3)+(-8)

= 5 - 7 + 3 + (-8)

= (-2) + 3 + (-8)

= 1 + (-8)

= -7

b, -(-15)-|-10|+|-9|-|5I

= 15 - 10 + 9 - 5

= 5 + 9 - 5

= 14 - 5

= 9

c, 14-(-13)-(17)+(-12)

= 14 + 13 - 17 + (-12)

= 27 - 17 + (-12)

= 10 + (-12)

= 2

d, -|-14| + |-10| - (-12) + (-8)

= -14 + 10 + 12 + (-8)

= (-4) + 12 + (-8)

= 7 + (-8)

= -1

e, -(-11) + (-15) + (13) - 21

toan lop 6 ma chi

\(a.\)\(\Rightarrow\) \(3x-2=\frac{5}{7}\)hoặc \(3x-2=-\frac{5}{7}\)

    \(\Rightarrow x=\frac{19}{21}\)         hoặc \(x=\frac{3}{7}\)

tíc mình nha