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Junior high school and senior high school mathematics courseware
1 、( x? -ax-a)=( 1+a)? -a( 1+a)-a= 1+2a+a? -Ah.-Ah? -a= 1

(x? Axe? + 1)=x? (x-a)+ 1=x? + 1= 1+2a+a? + 1=5+2a

So (x? -ax-a)(x? Axe? + 1)(5-2a)= 1×(5+2a)(5-2a)= 25-4a? = 13

2. Because of 2m? =3m+ 1, so 2m? -3m= 1,

8m to the fourth power -24m? +20m? -3m=8m to the 4th power-12m? - 12m? + 18m? +2m? -3m

=4m? (2m? -3m)-6m(2m? -3m)+(2m? -3m)

=4m? -6m+ 1

=2(2m? -3m)+ 1=2+ 1=3

3. I haven't figured it out yet:)

4. Because 14(x? +y? +z? )=(3x+2y+z)? So 14x? + 14y? + 14z? =9x? +4y? +z? + 12xy+6xz+4yz

5x? + 10y? + 13z? - 12xy-6xz-4yz=0

4x? - 12xy+9y? +x? -6xz+9z? +4z? -4yz+y? =0

(2x-3y)? +(x-3z)? +(2z-y)? =0

So: 2x = 3y, x = 3z, 2z = y.

x:y:z=3z:2z:z=3:2: 1

5、a? +3a? +3a+2=0

Answer? +3a? +3a+ 1+ 1=0

(a+ 1)? + 1=0

(a+ 1)? =- 1

Then: 20 10 (a+ 1) power+201(A+ 1) power +20 12 (a+/kloc-