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受欢迎的代数 >

0.8=(((0.8-y)(0.8-y)))/((0.4+y))

解答

0.8 = \frac{( ( 0.8 - y ) ( 0.8 - y ) )}{( 0.4 + y )}

解答

y = \frac{2.4 + 4.48}{2}, y = \frac{2.4 - 4.48}{2}

+1

十进制

y = 2.25830 \dots, y = 0.14169 \dots

求解步骤

0.8 = \frac{( ( 0.8 - y ) ( 0.8 - y ) )}{( 0.4 + y )}

化简

\frac{( 0.8 - y ) ( 0.8 - y )}{0.4 + y} : \frac{( 0.8 - y ) ^{2}}{0.4 + y}

0.8 = \frac{( 0.8 - y ) ^{2}}{0.4 + y}

在两边乘以

0.4 + y

0.8 (0.4 + y) = (0.8 - y)^{2}

解

0.8 (0.4 + y) = (0.8 - y)^{2} : y = \frac{2.4 + 4.48}{2}, y = \frac{2.4 - 4.48}{2}

y = \frac{2.4 + 4.48}{2}, y = \frac{2.4 - 4.48}{2}

验证解

找到无定义的点（奇点）:

y = - 0.4

将不在定义域的点与解相综合:

y = \frac{2.4 + 4.48}{2}, y = \frac{2.4 - 4.48}{2}

作图

流行的例子

7/(5(x+1/2)-0.7)=3(-x-1.2)+5

\frac{7}{5 ( x + \frac{1}{2} ) - 0.7} = 3 (- x - 1.2) + 5

4*((10)/x)^2-6*((10)/x)^2+3*((10)/x)^2=1

4 \cdot (\frac{10}{x})^{2} - 6 \cdot (\frac{10}{x})^{2} + 3 \cdot (\frac{10}{x})^{2} = 1

((1+x))/((11-x))= 1/3

\frac{( 1 + x )}{( 11 - x )} = \frac{1}{3}

solvefor x,9 y/x =2

so l v e f or x, 9 \frac{y}{x} = 2

solvefor x,x^2+(y-4/(x^2))2=2

so l v e f or x, x^{2} + (y - \frac{4}{x ^{2}}) 2 = 2