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
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