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受欢迎的代数 >

9x-7\sqrt[3]{x}-2=0

解答

9 x - 7 3 x - 2 = 0

解答

x = 1, x = - \frac{1}{27}, x = - \frac{8}{27}

+1

十进制

x = 1, x = - 0.03703 \dots, x = - 0.29629 \dots

求解步骤

9 x - 7 3 x - 2 = 0

去除根式

- 343 x = - 729 x^{3} + 486 x^{2} - 108 x + 8

解

- 343 x = - 729 x^{3} + 486 x^{2} - 108 x + 8 : x = 1, x = - \frac{1}{27}, x = - \frac{8}{27}

x = 1, x = - \frac{1}{27}, x = - \frac{8}{27}

验证解:

x = 1

真

, x = - \frac{1}{27}

真

, x = - \frac{8}{27}

真

解为

x = 1, x = - \frac{1}{27}, x = - \frac{8}{27}

作图

流行的例子

solvefor y,sqrt(x)+sqrt(y)=8

so l v e f or y, x + y = 8

solvefor y,x^{2/3}+y^{2/3}=5

so l v e f or y, x^{\frac{2}{3}} + y^{\frac{2}{3}} = 5

4 w + 4 = - 4

-2x^{3/4}+47=-7

- 2 x^{\frac{3}{4}} + 47 = - 7

x^{1/2}-3x^{1/4}+2=0

x^{\frac{1}{2}} - 3 x^{\frac{1}{4}} + 2 = 0