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18x2-19x+5=(9x+m)(2x+n),則m=_____,n=_____.

求20道因式分解計算題,20道整式乘法計算題,20道二元一次方程組計算題,20道不等式組計算題,要有答案的

  1. 因式分解

a2(b2-c2)-c2(b-c)(a+b)=_________.

(a-2b)(3a+4b)+(2a-4b)(2a-3b)=(a-2b)·( ).

(2x+1)y2+(2x+1)2y=_________

(x-y)n-(x-y)n-2=(x-y)n-2·_________.

m(a-m)(a-n)-n(m-a)(a-n)=_________.

x(m-n)+(n-m)y-z(m-n)=(m-n)( ).

(x+2y)(3x2-4y2)-(x+2y)2(x-2y)=________.

21a3b-35a2b3=_________.

3x2yz+15xz2-9xy2z=__________.

x2 -2xy-35y2 =(x-7y)( ).

2x2-7x-15=(x-5)( ).

20x2-43xy+14y2=(4x-7y)( ).

18x2-19x+5=( )(2x-1).

6x2-13x+6=( )( ).

5x2 +4xy-28y2 =( )( ).

-35m2 n2 +11mn+6=-( )( ).

6+11a-35a2=( )( ).

6-11a-35a2=( )( ).

-1+y+20y2 =( )( ).

20x2+( )+14y2=(4x-7y)(5x-2y).

x2-3xy-( )=(x-7y)(x+4y).

x2 +( )-28y2 =(x+7y)(x-4y).

x2+( )-21y2=(x-7y)(x+3y).

kx2+5x-6=(3x-2)( ),k=______.

6x2+5x-k=(3x-2)( ),k=______.

6x2+kx-6=(3x-2)( ),k=______.

18x2-19x+5=(9x+m)(2x+n),則m=_____,n=_____.

18x2 +19x+m=(9x+5)(2x+n),則m=_____,n=_____.

20x2 -43xy+14y2 =(4x+m)(5x+n),則m=_____,n=_____.

20x2-43xy+m=(4x-7y)(5x+n),則m=_____,n=_____.

x4-4x3+4x2 -1=_______.

2x2 -3x-6xy+9y=________.

21a2 x-9ax2 +6xy2 -14ay2 =________.

a3+a2b+a2c+abc=________.

2(a2-3ac)+a(4b-3c)=_________.

27x3 +54x2 y+36xy2 +8y3 _______.

(x+y)2+(x+m)2-(m+n)2-(y+n)2=_______.

25x2 -4a2 +12ab-9b2 =_______.

a2-c2+2ab+b2-d2-2cd=_______.

x4 +2x2 +1-x2 -2ax-a2 =________.

a2-4b2-4c2-8bc=__________.

a2+b2+4a-4b-2ab+4=________.

2.不等式組

1.5.2-5x<=3(1-x)
(x+2)/3>2x-1

2.5x-3>x-4

1+2/3-x<=x-1/3

3、5X+6<3X
8-7X>4-5X
4、2(1+X)>3(X-7)
4(2X-3)>5(X+2)
5、2X<4
X+3>0
6、1-X>0
X+2<0
7、5+2X>3
X+2<8
8、2X+4<0
1/2(X+8)-2>0
9、5X-2≥3(X+1)
1/2X+1>3/2X-3
10、1+1/2X>2
2(X-3)≤4


1. 3x(x+5)>3x2+7
x-4 < 2x+1
2. 3x+14 > 4(2x-9)
3x-7≥4x-4
3. 2x-3x-3<6
0.4(x-1)≥0.3-0.9x
4. x-4 < 2x+1
2x-6 < x-2
5. 3×10x<500
7(X+3)>98
6. 2x-3x+3<6
2x-3x+1<6
7. 2x-3x+3<1
2x-19<7x+31
8. 3x-2(9-x)>3(7+2x)-(11-6x)
2(3x-1)-3(4x+5)≤x-4(x-7)
9. 2(x-1)-x>3(x-1)-3x-5
15-(7+5x)≤2x+(5-3x)

10.2x-3>0

4-3x<0

3.乘法計算題

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
11. 7 × 5/49 + 3/14
12. 6 ×( 1/2 + 2/3 )
13. 8 × 4/5 + 8 × 11/5
14. 31 × 5/6 – 5/6
15. 9/7 - ( 2/7 – 10/21 )
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

4.二元一次方程組

1.2x+9y=81
3x+y=34
2.9x+4y=35
8x+3y=30
3.7x+2y=52
7x+4y=62
4.4x+6y=54
9x+2y=87
5.2x+y=7
2x+5y=19
6.x+2y=21
3x+5y=56
7.5x+7y=52
5x+2y=22
8.5x+5y=65
7x+7y=203
9.8x+4y=56
x+4y=21
10.5x+7y=41
5x+8y=44
11.7x+5y=54
3x+4y=38
12.x+8y=15
4x+y=29
13.3x+6y=24
9x+5y=46
14.9x+2y=62
4x+3y=36
15.9x+4y=46
7x+4y=42
16.9x+7y=135
4x+y=41
17.3x+8y=51
x+6y=27
18.9x+3y=99
4x+7y=95
19.9x+2y=38
3x+6y=18
20.5x+5y=45
7x+9y=69
希望對你有幫助!O(∩_∩)O哈哈~(打字打地我累死了!?。?/p>

如果18x的平方+19x+m=(9x+5)(2x+n),則m= ,n= 好的給懸賞

18x2-19x+5=(9x+m)(2x+n),m= n= 18x2-19x+5 =(2x-1)(9x-5) m=-5 n=-1

急!急!數(shù)學知識

18x^2+19x+m=(9x+5)(2x+n) 18x^2+19x+m=18x^2+(10+9n)x+5n 所以5n=m 19=10+9n n=1,m=5

初中因式分解問題。大家?guī)蛶兔Α?/h3>1、題目出錯了,應(yīng)為X3 X3+6X2+11X+6 =X3+6X2+9X+2X+6 =X(X2+6X+9)+2(X+3) =X(X+3)2+2(X+3) =(X+3)(X2+3X+2) =(X+3)(X+1)(X+2) 2、將(X+1)和(X+4),(X+2)和(X+3)組合相乘展開 (X+1)(X+2)(X+3)(X+4)-24 =(X2+5X+4)(X2+5X+6)-24 =(X2+5X+4)2+2(X2+5X+4)-24 =(X2+5X+4+6)(X2+5X+4-4) =X(X+5)(X2+5X+10) 3、a3+a2b+ab2+b3 =a2(a+b)+b2(a+b) =(a+b)(a2

若18x^2+mx+5=(9x-5)(2x-1),則m=()。

把后面的展開會變?yōu)?8x^2-19x+5,左右兩邊要相等,那么m=-19
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