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受欢迎的代数 >

3x^2+2(x^2-20)=16-2x^2

解答

3 x^{2} + 2 (x^{2} - 20) = 16 - 2 x^{2}

解答

x = 22, x = - 22

+1

十进制

x = 2.82842 \dots, x = - 2.82842 \dots

求解步骤

3 x^{2} + 2 (x^{2} - 20) = 16 - 2 x^{2}

展开

3 x^{2} + 2 (x^{2} - 20) : 5 x^{2} - 40

5 x^{2} - 40 = 16 - 2 x^{2}

将

40

到右边

5 x^{2} = - 2 x^{2} + 56

将

2 x^{2}

para o lado esquerdo

7 x^{2} = 56

两边除以

7

x^{2} = 8

对于

x^{2} = f (a)

解为

x = f (a), - f (a)

x = 8, x = - 8

8 = 22

- 8 = - 22

x = 22, x = - 22

作图

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