1、（3x+2）(3x-2)-5x(x-1)-(2x-1)^2 ,其中x=-1/3 先化简,在求值 2、999^2-1000998 3.比较大小：(1) 4^2+3^223*4 (-2)^2+1^22(-2)1 6^2+7^2267 3^2+3^2_233 (2/3)^2 +(-1)^2_22/3(-1) (2/3)^2+(2/3)^2___22/32/3

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1、（3x+2）(3x-2)-5x(x-1)-(2x-1)^2,其中x=-1/3先化简,在求值2、999^2-1000*9983.比较大小：(1)4^2+3^2____2*3*4(-2)^2+1^2_

1、（3x+2）(3x-2)-5x(x-1)-(2x-1)^2 ,其中x=-1/3 先化简,在求值 2、999^2-1000*998 3.比较大小：(1) 4^2+3^2____2*3*4 (-2)^2+1^2____2*(-2)*1 6^2+7^2______2*6*7 3^2+3^2_____2*3*3 (2/3)^2 +(-1)^2_____2*2/3*(-1) (2/3)^2+(2/3)^2_____2*2/3*2/3
1、（3x+2）(3x-2)-5x(x-1)-(2x-1)^2 ,其中x=-1/3 先化简,在求值
2、999^2-1000*998
3.比较大小：(1) 4^2+3^2____2*3*4
(-2)^2+1^2____2*(-2)*1
6^2+7^2______2*6*7
3^2+3^2_____2*3*3
(2/3)^2 +(-1)^2_____2*2/3*(-1)
(2/3)^2+(2/3)^2_____2*2/3*2/3
(2)从上面这些算式中,你发现了什么规律?你能用含字母的式子揭示这一道理吗?

1、（3x+2）(3x-2)-5x(x-1)-(2x-1)^2 ,其中x=-1/3 先化简,在求值 2、999^2-1000*998 3.比较大小：(1) 4^2+3^2____2*3*4 (-2)^2+1^2____2*(-2)*1 6^2+7^2______2*6*7 3^2+3^2_____2*3*3 (2/3)^2 +(-1)^2_____2*2/3*(-1) (2/3)^2+(2/3)^2_____2*2/3*2/3
(1)
（3x+2)(3X-2)-5x(x-1)-(2x-1)2
=9X^2-4-5X^2+5X-(2x-1)^2
=4X^2-(2x-1)^2-4+5X
=(2X-2X+1)(2X+2X-1)-4-5X
=4X-1-4-5X
=-X-5
把X=三分之一代入
得该式等于-16/3
(2)
999^2-1000*998
=999^2-(999+1)(999-1)
=999^2-(999^-1)
=1
(3)
大于大于大于等于大于大于
n^2+m^2 大于等于 2*m*n
因为
a^2-2ab+b^2=(a-b)^2
(a-b)^2>=0
所以
a^2-2ab+b^2>=0
a^2+b^2>=2ab

1. 9 x^2-4-5x^+5x-4x^2-1+4x=9x-4=3-4=-1

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