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1. 计算：

1. 计算：. 2. 己知 10 m =4 , 10 n =5 , 求 10 3m+2n 的值。. 3. 先化简，后求值 :3x(-4x 3 y 2 ) 2 -(2x 2 y) 3 ·5xy 其中 x=1, y=2. 4. 己知 x+5y=6 , 求 x 2 +5xy+30y 的值。. 5. 解方程： (2x-3) 2 = (x-3)(4x+2). 6. 解不等式： (3x+4)(3x-5)<9(x-2)(x+3). 9. 己知 2x-3y=-4 , 求代数式 4x 2 +24y-9y 2 的值。. 当 x=-1 ,y=-2 时，求代数式

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1. 计算：

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  1. 1.计算：

  2. 2. 己知10m=4 , 10n=5 , 求103m+2n的值。

  3. 3. 先化简，后求值:3x(-4x3y2)2-(2x2y)3·5xy 其中 x=1, y=2 . 4. 己知x+5y=6 , 求 x2+5xy+30y 的值。

  4. 5.解方程：(2x-3)2 = (x-3)(4x+2) 6.解不等式：(3x+4)(3x-5)<9(x-2)(x+3)

  5. 9.己知 2x-3y=-4 , 求代数式4x2+24y-9y2的值。 • 当x=-1 ,y=-2 时，求代数式 • [2x2-(x+y)(x-y)][(-x-y)(-x+y)+2y2]的值.

  6. 12.计算：(x+1)(x+2)(x+3)(x+4)

  7. 15.用科学记数法表示：0.0000000461 16.己知x+y=4 , 求 x3+12xy+y3的值。

  8. 13. 计算：(a-1)(a4+1)(a2+1)(a+1) 14. 计算：(2a-b)2(b+2a)2

  9. 17. 己知x+y=3 ，x2+y2=5 则xy 的值等于多少？ 18. 己知x-y=4 , xy=21 ,则 x2+y2的值等于多少？

  10. 19. 根据己知条件，确定m ,n 的值 (a)己知：25m·2·10n=57·24 (b)己知: (x+1)(x2+mx+n) 的计算结果不含x2和x项。

  11. 20. 己知：x+x-1=-3 , 求代数式x4+x-4的值。 21．计算：(a+b)[(a+b)2-3ab](a-b)[(a-b)2+3ab]

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