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受欢迎的代数 >

sqrt(20-r)=r

解答

20 - r = r

解答

r = 4

求解步骤

20 - r = r

两边进行平方:

20 - r = r^{2}

20 - r = r^{2}

解

20 - r = r^{2} : r = 4, r = - 5

r = 4, r = - 5

验证解:

r = 4

真

, r = - 5

假

解是

r = 4

作图

流行的例子

solvefor f,sqrt(3gf-2)=r

so l v e f or f, 3 g f - 2 = r

5 m = 4

sqrt(4(x+11))-3=x

4 (x + 11) - 3 = x

sqrt(x+2)=6-sqrt(7x+2)

x + 2 = 6 - 7 x + 2

5(2x-1)^{2/3}=125

5 (2 x - 1)^{\frac{2}{3}} = 125