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1,x^30=x^2 *_______=(x^3 * _______)^2=(x * (%x...

三个解x1=2 x2=3 x3=-5 解题过程x^5-18x^3+30x^2-19x+30 =x(x^4-18x^2+81)+30x^2-100x+30 =x(x^2-9)^2+10(3x^2-10x+3) =x(x+3)^2(x-3)^2+10(3x-1)(x-3) =(x-3)[x(x-3)(x+3)^2+10(3x-1)] =(x-3)(x^4+3x^3-9x^2+3x-10) =(x-3)[(x^4+x^2)+(3x^3+3x)...

待续

(x^2-5x-1)×(x^2-5x-2)-30 =(x²-5x)²-3(x²-5x)+2-30 =(x²-5x)²-3(x²-5x)-28 =(x²-5x+4)(x²-5x-7) =(x-1)(x-4)(x²-5x-7)

这里面所指的企业利润是经济利润。 经济利润=总收益-总成本=总收益-总可变成本-总固定成本 在本题中可令总固定成本为TFC,由题意知总可变成本TVC=CX=X^3-30X^2+310X 总利润TR=PX=310X 所以有TR-TVC-TFC=310X-X^3+30X^2-310X-TFC=0可得TFC=-X^3+3...

f(x)=x³-9x²+29x-30 f'(x)=3x²+18x+29 f''(x)=6x+18 拐点x=-3 令g(x)=(x+3)³-9(x+3)²+29(x+3)+C g(0)=27-81+98+C=0➝C=-33 g(x)=(x+3)³-9(x+3)²+29(x+3)-33 =x³+9x²+27x+27-9x²-54x-81...

30x^2-28x+6=0 15x^2-14x+3=0 (3x-1)(5x-3)=0 x1=1/3, x2=3/5

证明:如果有整数x,y使方程成立, 则 由17*29-5 = 488 = 4x^2+12xy-8y^2 = (2x+3y)^2-17y^2 知(2x+3y)^2+5能被17整除. 设2x+3y=17n+a,其中a是0,±1,±2,±3,±4,±5,±6,±7,±8中的某个数,但是这时 (2x+3y)^2+5 =(17n)^2+34na+(a^2+5...

x+30×2=2.5x, 2.5x-x=30×2, 1.5x=60, x=60÷1.5, x=40

原解很对呀 lim【(2x-3)^20 * (3x+2)^30]/(2x+1)^50 】=lim(2-3/x)^20*lim(3+2/x)^30 / lim(2+1/x)^50 =【lim(2-3/x)】^20* 【lim(3+2/x)】^30 / 【lim(2+1/x)】^50 =2^20 * 3^30 / 2^50 =3^30/2^30 =(2/3)^30

(x+15)²-225-450=0 (x-15)²=675 x=15根号3±15

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