用完全平方差公式计算以下题目。 像（a+b-c）(a-b+c)，关于完全平方公式和平方差公式...
\u521d\u4e0010\u9053\u8ba1\u7b97\u9898..(\u8fc7\u7a0b\u8be6\u7ec6)\u5bf9\u7b54\u6848\u554a\u8fd960\u5206\u6211\u8981\u4e86\u3002\u3002\u3002
(1).27\u00d733 =(30-3)(30+3)=891
(2).5.9\u00d76.1 =(6-0.1)(6+0.1)=35.99
(3).99\u00d7101 =(100-1)(100+1)=9999
(4).1005\u00d7995 =(1000+5)(1000-5)=999975
2.\u5229\u7528\u5b8c\u5168\u5e73\u65b9\u5dee\u516c\u5f0f\u8ba1\u7b97:
(1).99^2 =(100-1)²=100²-2*100*1+1²=9801
(2).1002^2 =(1000+2)²=1000²+2*1000*2+2²=1004004
3.\u8ba1\u7b97:
(1).-1/8a^5b^4c^2\u00f7(4a^2b) =-1/32a^7b^5c^2
(2).5(x-y)^5\u00f7(x-y)^2 =5(x-y)^3
(3).[x(x+1)+x^2(x-1)]\u00f7(-3x) =x(x+1)/-3x+x^2(x-1)/-3x=x^2-2x-1/3
(4).[(m+n-p)(m+p+n)-(m+n)^2]\u00f7(-p)=(m^2+mn+pm+mn+n^2+pn-pm-pn-p^2-(m+n)^2)\u00f7(-p)=((m+n)^2-(m+n)^2-p^2)\u00f7(-p)=p
\u627e\u5bf9\u4eba\u4e86\uff0c\u6211\u4eec\u521d\u4e00\u521a\u5b66\u8fd9
(1) (-m+5n)(-m-5n) (2) (3x-1)(3x+1) (3) (y+3x)(3x-y) (4) (-2+ab)(2+ab) 2.\u8fd0\u7528\u516c\u5f0f\u8ba1\u7b97\uff1a (1) (2x-3)2 (2) (-2x+3y)(-2x-3y) (3) ( m-3)( m+3) (4) ( x+6y)2 (1) (x+6)2 (2) (y-5)2 (3) (-2x+5)2 (4) ( x- y)2 (1) (a+2b-1)2 (2) (2x+y+z)(2x-y-z) \uff083\uff09 \uff084\uff098\u3001 (a + b\uff0dc) (a\uff0db + c\uff09 \u767e\u5ea6\u6587\u5e93\u4e0a\u4e5f\u6709\u597d\u591a\u4f8b\u9898\u5730\u5740
5.4.2 \u5b8c\u5168\u5e73\u65b9\u516c\u5f0f\u7ec3\u4e60\u4e0e\u62d4\u9ad8\u9898(1)(\u542b\u7b54\u6848)_\u767e\u5ea6\u6587\u5e93 http://wenku.baidu.com/view/221b86ef856a561252d36f47.html
\u5e73\u65b9\u5dee\u516c\u5f0f\u7ec3\u4e60(\u57fa\u7840+\u63d0\u9ad8)_\u767e\u5ea6\u6587\u5e93 http://wenku.baidu.com/view/64962d65f5335a8102d220b9.html?from=rec&pos=0&weight=949&lastweight=444&count=5
\u5e73\u65b9\u5dee\u516c\u5f0f\u4e60\u9898\u7cbe\u9009_\u767e\u5ea6\u6587\u5e93 http://wenku.baidu.com/view/f342ef93daef5ef7ba0d3cb4.html?from=rec&pos=2&weight=575&lastweight=431&count=5
\u5e73\u65b9\u5dee\u516c\u5f0f\u548c\u5b8c\u5168\u5e73\u65b9\u516c\u5f0f\u5f3a\u5316\u7ec3\u4e60_\u767e\u5ea6\u6587\u5e93 http://wenku.baidu.com/view/a1f735afdd3383c4bb4cd292.html?from=rec&pos=2&weight=384&lastweight=237&count=5
\u5e73\u65b9\u5dee\u516c\u5f0f\u3001\u5b8c\u5168\u5e73\u65b9\u516c\u5f0f\u3001\u6574\u5f0f\u7684\u9664\u6cd5_\u767e\u5ea6\u6587\u5e93 http://wenku.baidu.com/view/db3d5bd776a20029bd642dc4.html?from=related&hasrec=1
\u54ea\u9898\u4e0d\u4f1a\u5199\u53ef\u4ee5\u95ee\u6211\uff0c\u795d\u4f60\u5b66\u4e60\u5e2e\u5e2e\uff0c\u5e0c\u671b\u8fd9\u4e9b\u8d44\u6599\u5bf9\u4f60\u6709\u7528\uff01
=9960.04
2005^2=(2000+5)^2=4000000+2*2000*5+25
=4020025
99.8的平方等于100减0.2括号的平方，根据完全平方差公式，等于100的平方减去100乘0.2的2倍，再加上0.2的平方，就等于10000减去40再加上0.04，最后结果等于9960.04。同理，2005的平方等于2000加上5括号的平方，等于4020025。
99.8平方=（99+0.8）平方=（100-0.2）平方
2005=（2000+5）平方
要算什么
绛旓細=4020025
绛旓細=0.3*7 =2.1
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