5个9加减乘除怎么等于100

1:75道计算题。包括 、-、*、/、乘方。有点括号也行。(不一定全部都有) : 1. 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
0.12χ 1.8×0.9=7.2 (9-5χ)×0.3=1.02 6.4χ-χ=28 4.4
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 21. 5/7 × 3/25 3/7 22. 3/14 ×× 2/3 1/6 23. 1/5 × 2/3 5/6 24. 9/22 1/11 ÷ 1/2 25. 5/3 × 11/5 4/3 2:75道化简求值。有大、中、小括号(不一定全有):

3.3ab-4ab 8ab-7ab ab=______.
4.7x-(5x-5y)-y=______.
5.23a3bc2-15ab2c 8abc-24a3bc2-8abc=______.
6.-7x2 6x 13x2-4x-5x2=______.
7.2y (-2y 5)-(3y 2)=______.
11.(2x2-3xy 4y2) (x2 2xy-3y2)=______.
12.2a-(3a-2b 2) (3a-4b-1)=______.
13.-6x2-7x2 15x2-2x2=______.
14.2x-(x 3y)-(-x-y)-(x-y)=______.
16.2x 2y-[3x-2(x-y)]=______.
17.5-(1-x)-1-(x-1)=______.
18.( ) (4xy 7x2-y2)=10x2-xy.
19.(4xy2-2x2y)-( )=x3-2x2y 4xy2 y3.
21.已知A=x3-2x2 x-4,B=2x3-5x 3,计算A B=______.
22.已知A=x3-2x2 x-4,B=2x3-5x 3,计算A-B=______.
23.若a=-0.2,b=0.5,代数式-(|a2b|-|ab2|)的值为______.
25.一个多项式减去3m4-m3-2m 5得-2m4-3m3-2m2-1,那么这个多项式等于______.
26.-(2x2-y2)-[2y2-(x2 2xy)]=______.
27.若-3a3b2与5ax-1by 2是同类项,则x=______,y=______.
28.(-y 6 3y4-y3)-(2y2-3y3 y4-7)=______.

非常抱歉,三线八角真的不好找,何况上面的 我都找了十多分钟。。。

99÷9×9﹢9=100