1 2(1-2x)²=8的解是多少?
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x(x+1)(x+7)(x+8)=x(x+8)(x+1)(x+7)=(x²+8x)(x²+8x+7)=6×(6+7)=78
-1=a-1/2-1/6-1/12-1/20'''''''-1/9900-a=1-1/2-1/6-1/12-1/20''''''-1/9900-a=1/100a=-1/100
设a=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)那么y=a*(x-10);那么y^=a^*(x-10)+a*(x-10)^=a^*(x-10)+a那么y
1、56-8X=11+X8X+X=56-119X=45X=52、3X-2=X+1+6X3X-2=7X+17X-3X=-2-14X=-3X=-3/43、7+X=2X+20-14X7+X=20-12XX+
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550120x=550x=55/12=4.583
x+x^2+x^3+x^4+x^5+x^6+x^7+x^8=(x+x^2+x^3+x^4)+(x^5+x^6+x^7+x^8)=x(1+x+x^2+x^3)+x^5(1+x+x^2+x^3)=(x+x
去掉绝对值原式=x+1-x-2+x+3-x-4+x+5-x-6+x+7-x-8+x+9-x-10+x+11-x-12+x+13=x+13-6=x+7=π/3+7
有括号吗?如果没有括号(2x²-20x/x²-14x+4)就应该是(2x²-20/x-14x+4)(1-x-12/2-x)就应该是(1-x-6-x)=(-5-2x)
X(X^2-6X-9)-X(X^2-8X-15)+2X(3-X)=X^3-6X^2-9X-X^3+8X^2+15X+6X-2X^2=12x带入X=1/3原式=12*1/3=4
3x²+2x²-3x-(-x+5x²)=3x²+2x²-3x+x-5x²=-2x其中x=314时,-2x=-2*314=-6285xy-8x
1+x+x^2+x^3=0x+x^2+x^3+x^4+x^5+x^6+x^7+x^8=(x+x^2+x^3+x^4)+(x^5+x^6+x^7+x^8)=x(1+x+x^2+x^3)+x^5(1+x+
设x1=4-√3,x2=4+√3,是方程X^2-8X+13=0的两根所以X1^2-8X1+15=2X^4-6X^3-2X^2+18X+23=(X+1)^2*(X^2-8X+13)+10=10所以原式=
就是构造多项式x³-7x+1x^8-6x^6+3x^5-7x^4-12x^3+2x^2-7x+6=x^8-7x^6+x^5+x^6-7x^4+x^3+2x^5-14x^3+2x^2+x^3-
x(x+1)(x²-2x-4)=0x1=0x2=-1x²-2x-4=0x²-2x+1=5(x-1)²=5x3=1+√5x4=1-√5x³-2x+1=0
60X+15X+10X+6X=12091X=120X=120/91
x^10+2x^9-2x^8-2x^7+x^6+3x^2+5x+1=x^10+x^9+x^9-x^8-x^8-x^7-x^7+x^6+3x^2+5x+1=(x^10+x^9)+(x^9-x^8)-(x
y=-3x的平方+12x-3=-3(x²-4x)-3=-3(x-2)²+9y=4x的平方-24x+26=4(x²-6x)+26=4(x-3)²-10y=2x的平
分母里有个1是什么意思,无视掉的话是这个.-49/16再问:那4/1是1/4!再答:-721/240应该是这个
x-1/x=3=>x^2+1/x^2=(x-1/x)^2+2=3^2+2=11(x+1/x)^2=(x-1/x)^2+4=9+4=13=>x+1/x=√13=>x^3+1/x^3=(x+1/x)(x^
t的2次方-8t+12;=t²-2t-6t+12=t(t-2)-6(t-2)=(t-2)(t-6)x的2次方+7x-18;=x²+9x-2x-18=x(x+9)-2(x+9)=(x