22. [(3x-y2)+3y (x-)] [(2x+y) 2-4y (x+y)], where x =-7.8 and y = 8 are reported.
The respondent supplemented 2009-08-1709:12 (1). (X- 1)-(2x+ 1) =-X-2。
(2).3(x-2)+2( 1-2x)=-x-4
(3).3(2b-3a)+3(2a-3b)=-3a-3b
(
4).(3x^2-xy-2y^2)-2(x^2+xy-2y^2)=(3x-y)(x+2y)-(x+2y)(x-y)=3y(x+2y)
(5)7a^b-(-4a^b+5ab^2)-2(2a^2b-3ab^2)=7a^b+4a^b-5ab^-4a^b+6ab^=-a^b+ab^=ab(b-a)
100× 103× 104 = ; ②-2a3b4÷ 12a3b2 =
、(8xy 2-6x2y)÷(-2x)= 1
、(a+2b-3c)(a-2b+3c)=[a+ ( )] [a-( )]
、(-3x-4y) ( ) = 9x2- 16y2 .
、(a+2b-3c)(a-2b+3c)=[a+ ( )] [a-( )]
2(x3)2 x3-(2 x3)3+(-5x)2 x7
1.(2a+3b)*(2a-b)
2. Square of (2x+y-1)
Solution 1. (2a+3b)*(2a-b) Use cross multiplication.
2 2 =4a2-3b2+4ab
3 - 1
2. The square of (2x+y-1) =4x2+y2+4xy+1-4x-2y
(3)2(a b-3)(4)-3(ab2c+2bc-c)(5)(―2a3b)(―6ab 6c)(6)(2xy 2)3yx
( 1)2ab(5ab2+3a2b) (2)
Third, consolidate the exercises:
1, true or false:
( 1) 3a3 5a3= 15a3()
(2) ( )
(3) ( )
(3) -x2(2y2-xy)=-2xy2-x3y()
2. Calculation problems:
(3) (4) -3x(-y-xyz)
(5) 3x2(-y-xy2+x2) (6) 2ab(a2b- c)
(7) (A+B2+C3) (-2A) (8) [-(A2) 3+(AB) 2+3] (AB3) Supplementary information of the filling object 2009-08- 17 09: 13 Off-balance sheet calculation: (/kloc
2.88 1/0.43-3.5*0.24
13.5*0.68/8.5
43.6-7.6*4. 1
(86.9+667.6)/50.3
(73.5+80.5)/( 10+ 12)
(7.8* 15+5. 1* 10+6*5)/( 15+ 10+5)
12.53- 1.35*2-9.3
0.8*(4-3.75)/0. 1
6- 1.3*( 10-7.3)
3/7 × 49/9 - 4/3
8/9 × 15/36 + 1/27
12× 5/6 – 2/9 ×3
8× 5/4 + 1/4
6÷ 3/8 – 3/8 ÷6
4/7 × 5/9 + 3/7 × 5/9
5/2 -( 3/2 + 4/5 )
7/8 + ( 1/8 + 1/9 )
9 × 5/6 + 5/6
3/4 × 8/9 - 1/3
7 × 5/49 + 3/ 14
6 ×( 1/2 + 2/3 )
8 × 4/5 + 8 × 1 1/5
3 1 × 5/6 – 5/6
9/7 - ( 2/7 – 10/2 1 )
5/9 × 18 – 14 × 2/7
4/5 × 25/ 16 + 2/3 × 3/4
14 × 8/7 – 5/6 × 12/ 15 17/32 – 3/4 × 9/24
3 × 2/9 + 1/3
5/7 × 3/25 + 3/7.3/ 14 ×× 2/3 + 1/6
1/5 × 2/3 + 5/6
9/22 + 1/ 1 1 ÷ 1/2
5/3 × 1 1/5 + 4/3
45 × 2/3 + 1/3 × 15
7/ 19 + 12/ 19 × 5/6
1/4 + 3/4 ÷ 2/3
8/7 × 2 1/ 16 + 1/2
3/7 × 49/9 - 4/3
2.8/9 × 15/36 + 1/27
3. 12× 5/6 – 2/9 ×3
4.8× 5/4 + 1/4
5.6÷ 3/8 – 3/8 ÷6
6.4/7 × 5/9 + 3/7 × 5/9
7.5/2 -( 3/2 + 4/5 )
8.7/8 + ( 1/8 + 1/9 )
9.9 × 5/6 + 5/6
10.3/4 × 8/9 - 1/3
1 1.7 × 5/49 + 3/ 14
12.6 ×( 1/2 + 2/3 )
13.8 × 4/5 + 8 × 1 1/5
14.3 1 × 5/6 – 5/6
15.9/7 - ( 2/7 – 10/2 1 )
16.5/9 × 18 – 14 × 2/7
17.4/5 × 25/ 16 + 2/3 × 3/4
18. 14 × 8/7 – 5/6 × 12/ 15
19. 17/32 – 3/4 × 9/24
20.3 × 2/9 + 1/3