化簡代數式

1.3a+6+2a+8=?

=3a+2a+6+8

=5a+14


2.2m-4n+(-7m)+3n=?

=2m-4n-7m+3n

=2m-7m-4n+3n

= -5m-n


3.(-5a)-4b+(-2a)+2b=?

= -5a+4b-2a+2b

= -7a+6b


4. 4a+2b-3a-6b=?

=4a-3a+2b-6b

=a-4b


5. 3x-2y-2x+y=?

=3x-2x-2y+y

=x-y


6. 4b-3-2b+2=?

=4b-2b-3+2

=2b-1


7.唔識

8.11m-6n-2+(-2m)-7n+8=?

=11m-6n-2-2m-7n+8

=11m-2m-6n-7n-2+8

=9m-13n+6



9. 3p+2g+12r+4p-2g-7r=?

=3p+4p+2g-2g+12r-7r

=7p+5r


10.7x-2y+3z-(-5x)+4y-2z=?

=7x-2y+3z+5x-4y+2z

=7x+5x-2y-4y+3z+2z

=12x-6y+5z


11.(-2m)-7n+1-4m-2n-1=?

=-2m+7n-1+4m+2n+1

=2m+4m+7n+2n-1+1

=6m+9n


12.7p+8q-2r-(-3p)+7q-2r=?

=7p+8q-2r+3p-7q+2r

=7p+3p+8q-7q-2r+2r

=10p+q


13.b+c乘3=?

=3c+b

14.(-b)+c乘a=?

=ac-b

15.唔識


[答案應該係咁,,錯左唔好怪我>_<]

1. 3a+6+2a+8=5a+14
2. 2m-4n+(-7m)+3n=2m-4n-7m+3n= -5m-n
3. (-5a)-4b+(-2a)+2b= -7a-2b
4. 4a+2b-3a-6b= a-4b
5. 3x-2y-2x+y=x-y
6. 4b-3-2b+2=2b-1
7. 3p-2q+4r+(-6p)7r ?? Is it something wrong??
8. 11m-6n-2+(-2m)-7n+8=9m-13n+6
9. 3p+2g+12r+4p-2g-7r=7p+5r
10.7x-2y+3z-(-5x)+4y-2z=12x+2y-z
11.(-2m)-7n+1-4m-2n-1= -6m-9n = -3(2m+3n)
12.7p+8q-2r-(-3p)+7q-2r=10p+15q-4r
13.b+c乘3=b+3c
14.(-b)+c乘a=ac-b
15.(-m)+n-p乘(-m) =(p-1)m+n