1 5(3-3 2x)-3(2-5 4x)=36
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2x+3x+5x=3210x=32x=3.2
是这样的:x^5+x^4=x^3(x^2+x)=(x^2+x)[(x^3-1)+1]=(x^2+x)(x^3-1)+x^2+x=[x(x+1)(x-1)](x^2+x+1)+x^2+x=(x^3-x)
|x-1|+|x-10|表示数轴上x到1的距离+x到10的距离.显然最小值是9,此时x只要在1到10之间就好.类似的,|x-2|+|x-9|的最小值是7,此时x在2到9之间就好.|x-3|+|x-8|
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550120x=550x=55/12=4.583
x(1+2+...+9)=x(9-8-7-...-1)x=0记得采纳啊
2x+3x+4x+5x+x+6x+7x=10028x=100x=100/28x=25/7
原式=[(1-1分之x+5)-(1-1分之x+4))+(1-1分之x+3)-(1-1分之x+2)]*[(x+3)(x+5)]\(x^2+7x+13)=[(1分之x+2)-(1分之x+3)+(1分之x+
(x-3)/5x=2/1515(x-3)=10x15x-45=10x5x=45x=9
(5X-15)-(2X+3)=X+123x-18=x+122x=30x=15
x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)x/(x-2)=2x/(x-3)+(1-x)/(x-2)(x-3)x(x-3)/(x-2)(x-3)=2x(x-2)/(x-2)(x-3)
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=
错了吧,是-9x2x²-5x=1原式=15x²-18x+4+3x²-18x+32-9x=18x²-45x+36=9(2x²-5x)+36=9+36=4
-x+(2x-2)-(3x+5)=-x+2x-2-3x-5去括号=-2x-7合并同类项刚才可能写错了,不好意思.再问:x前面有个负号再算算求你了再答:-x+2x=xx-3x=-2x-2-5=-7最后就
①=15x²-10x-x-1=15x²-11x-1②=15x-10-x-1=14x-11①是5x(3x-2)-(x-1)②是5乘(3x-2)-(x-1)你自己选吧
原式=[x/(x-3)]-[5x/(x²-x-6)]=[x/(x-3)]-(5x)/[(x-3)(x+2)]=[x(x+2)]/[(x-3)(x+2)]-(5x)/[(x-3)(x+2)]=
14x-6x²+10x²+5x=4x²-3x+3222x=32∴x=16/11
/>(x+2)/(x+1)-(x+3)/(x+2)-(x+4)/(x+3)+(x+5)/(x+4)=1+1/(x+1)-1-1/(x+2)-1-1/(x+3)+1+1/(x+4)=1/(x+1)-1/
5负1再答:
15-4+5X=2X+35-3X11+5X-2X+3X=356X=35-116X=24X=4