1, for example 1: 0.8a-20 18a4+n? Tong -EN

Example 2:- 1/322

2. Example1:(1) = 3 *1/9-2 * 9+1=-50/3.

(2)=(-8/3)? /0=0

Example 2: 3x? -6 -2 ( )? Divide by 2

3. Example 1: (1) Original formula =(5a? +a？ -5a？ )+(-3b？ -B? +2b？ )

=a？ -2b？

=- 1

(2) Original formula =9a? +2a？ +6a？ +4/3a？

= 1 1a？ +22/3a？

=-88+88/3

=- 176/3

Example 2: (1): Let this polynomial be a.

Yes: A+(a? -2a+ 1)=a？ +a- 1

∴ A=3a-2

(2):∫A = 2x？ +y？ +2z，B=x？ -Really? +z

∴ 2A-B=x？ +2y？ +z

1、 1/t(t- 1)x 2、2 -2/5 3、54、3 5 、-5

6.( 1) Original formula = 2 * 9-4 * 3 *1/2+4 *1/2.

= 10

(2) The original formula =(3? +4*3* 1/2)/(2*3* 1/2- 1/4)

= 12/ 1 1

7 、( 1)7/ 15m (2)56

8、3a？ b-2ab？ 5/3+6a？ -8ab

9. Answer

10、 1

1 1, (1) Original formula =-xy(4x+8y-2x+3y)

=-xy(2x+ 1 1y)

(2) The original formula =2x? +x-6

=(2x-3)(x+2)

(3) original formula =xy(5-3x-7y+6- 12+7y+8x)

=xy(5x- 1)

(4) The original formula =(x-y)? (2+5)

=7(x+y)

12, original formula =2a? b+2ab？ -2a？ b+2-2ab？ -2

=0

13, original formula =5ab? -2a？ b+4ab？ -2a？ b

=9ab？ -4a？ b

∵ :(a-2)？ +|b+ 1|=0

∴ a-2=0，b+ 1=0

∴ a=2，b=- 1

∴ Original formula = 9 * 2 * 1-4 * 4 *( 1)

=52