Question

化简代数式

Answer 1

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.唔识 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.唔识 [答案应该系咁

错左唔好怪我>_<]
参考: 自己做
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