.(X-2)^2-10(X-2)+25=0.(X-2)^2-10(X-2)+25=0.(X-2)^2-10(X-2)+25=0.(X-2)^2-10(X-2)+25=0.(X-2)^2-10(X-2)+25=0
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.(X-2)^2-10(X-2)+25=0.(X-2)^2-10(X-2)+25=0.(X-2)^2-10(X-2)+25=0.(X-2)^2-10(X-2)+25=0.(X-2)^2-10(X-2)
.(X-2)^2-10(X-2)+25=0.(X-2)^2-10(X-2)+25=0.(X-2)^2-10(X-2)+25=0.(X-2)^2-10(X-2)+25=0.(X-2)^2-10(X-2)+25=0
.(X-2)^2-10(X-2)+25=0
.(X-2)^2-10(X-2)+25=0
.(X-2)^2-10(X-2)+25=0
.(X-2)^2-10(X-2)+25=0
.(X-2)^2-10(X-2)+25=0
.(X-2)^2-10(X-2)+25=0.(X-2)^2-10(X-2)+25=0.(X-2)^2-10(X-2)+25=0.(X-2)^2-10(X-2)+25=0.(X-2)^2-10(X-2)+25=0
主要就是考这个:
(a-b)^2 = a^2 -2*a*b + b^2
同类还有一个公式:
(a+b)^2 = a^2 +2*a*b + b^2
不过 n^2 = 0 则 n=0 也是一个知识点.
若设a=X-2,b=5,可得到:a^2-2*a*b+b^2=0
即 (a-b)^2 = 0
a - b = 0
X-2 - 5 = 0
X = 7
展开原式也不难：
x^2-4x+4 - 10x+20 + 25=0
x^2 - 14x - 49 =0
(x-7)^2=0
x-7=0
x=7
解方程：（2x+5)(4x*x-10x+25)=8x(x*x+1)
x-2x+3x-4x+5x.+99x-100x=25求解
(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2
matlab解决约束非线性规划问题myfun.mfunction f=myfun(x)f=x(1)*x(13)+x(2)*x(14)+x(3)*x(15)+x(25)+1.697*(x(4)*x(16)+...x(5)*x(17)+x(6)*x(18)+x(26))+0.575*(x(7)*x(19)+x(8)*x(20)...+x(9)*x(21)+x(27))+0.723*(x(10)*x(22)+x(11)*x(23)+x(12)*x(24));
matlab解决约束非线性规划问题myfun.mfunction f=myfun(x)f=x(1)*x(13)+x(2)*x(14)+x(3)*x(15)+x(25)+1.697*(x(4)*x(16)+...x(5)*x(17)+x(6)*x(18)+x(26))+0.575*(x(7)*x(19)+x(8)*x(20)...+x(9)*x(21)+x(27))+0.723*(x(10)*x(22)+x(11)*x(23)+x(12)*x(24));
解方程(x/x(x+2))+(x/(x+2)(x+4))+.+x/(x+8)(x+10)=1
X+X+X+(X-1)+(X-2)+(X-3)+(X-4)=10(X-3)+(X-4)
x X 2x=25
x^2+10x( )=(x+ )^2
x^2-10x=2-x
2x×x=10,求x
f(x)=x^2+x (x
x*x+2x+x*x+10x+x*x+25+2x+x*x+1+1+16+x*x+4x*x+9-12x+16x*x+4-16x=30x*x-7x-15 求x,可以只要答案.如图,全是正方形,一个边长为1,一个边长为4,求总面积,你也可以用你的方法.上面那个方程是我列的.5x*X+7X-72=0
x/x^2-25-5/x^2+10x+25
(x^+x)^2-10(x^2+x)+25
=(x^2-5x)^2+10(x^2-5x)+24 =x^4-10x^3+25x^2+10x^2-50x+24 这是怎么转化的(X-1)(X-2)(X-3)(X-4) =(X-1)(X-4) (X-2)(X-3)=（x^2-5x+4)(x^2-5x+6)=(x^2-5x)^2+10(x^2-5x)+24=x^4-10x^3+25x^2+10x^2-50x+24=x^4-10x^3+35x^2-50x+24
x+2x×10=10x+2x+36
=（x^2-5x+4)(x^2-5x+6) =(x^2-5x)^2+10(x^2-5x)+24 是怎么转化的(X-1)(X-2)(X-3)(X-4) =(X-1)(X-4) (X-2)(X-3)=（x^2-5x+4)(x^2-5x+6)=(x^2-5x)^2+10(x^2-5x)+24=x^4-10x^3+25x^2+10x^2-50x+24=x^4-10x^3+35x^2-50x+24不好意思我弄错了，是=（x^2-5