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受欢迎的代数 >

pia= 1/2 pir^2

解答

πa = \frac{1}{2} π r^{2}

解答

r = 2 a, r = - 2 a

求解步骤

πa = \frac{1}{2} π r^{2}

交换两边

\frac{1}{2} π r^{2} = πa

化简

\frac{1}{2} π : \frac{π}{2}

\frac{π}{2} r^{2} = πa

在两边乘以

2

π r^{2} = 2 πa

两边除以

π

r^{2} = 2 a

对于

x^{2} = f (a)

解为

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

r = 2 a, r = - 2 a

作图

流行的例子

因式分解 x^2+3x=10

f a c t or x^{2} + 3 x = 10

2 (x - 5)^{2} - 64 = 0

solvefor s,A=s^2

so l v e f or s, A = s^{2}

(d+1)(d-5)=2d^2-7

(d + 1) (d - 5) = 2 d^{2} - 7

4 = 3 t^{2} - t