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受欢迎的代数 >

7d^2-9d+3=5d^2

解答

7 d^{2} - 9 d + 3 = 5 d^{2}

解答

d = \frac{9 + 57}{4}, d = \frac{9 - 57}{4}

+1

十进制

d = 4.13745 \dots, d = 0.36254 \dots

求解步骤

7 d^{2} - 9 d + 3 = 5 d^{2}

将

5 d^{2}

para o lado esquerdo

2 d^{2} - 9 d + 3 = 0

使用求根公式求解

d_{1, 2} = \frac{- ( - 9 ) \pm ( - 9 ) ^{2} - 4 \cdot 2 \cdot 3}{2 \cdot 2}

(- 9)^{2} - 4 \cdot 2 \cdot 3 = 57

d_{1, 2} = \frac{- ( - 9 ) \pm 57}{2 \cdot 2}

将解分隔开

d_{1} = \frac{- ( - 9 ) + 57}{2 \cdot 2}, d_{2} = \frac{- ( - 9 ) - 57}{2 \cdot 2}

d = \frac{- ( - 9 ) + 57}{2 \cdot 2} : \frac{9 + 57}{4}

d = \frac{- ( - 9 ) - 57}{2 \cdot 2} : \frac{9 - 57}{4}

二次方程组的解是:

d = \frac{9 + 57}{4}, d = \frac{9 - 57}{4}

作图

流行的例子

\frac{w}{2} \leq 2

6 x + 5 \geq 7 x

∣ x - 8 ∣ = 0.02

\frac{u}{5} = 12.5

-(4+r)+2-3r<-14

- (4 + r) + 2 - 3 r < - 14