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(9t-4)(-9t-4)=

发布时间:2017-07-28 13:44:05

解题(9t-4)(-9t-4)= 方程

简化
(9t + -4)(-9t + -4) = 0

重新排序条件:
(-4 + 9t)(-9t + -4) = 0

重新排序条件:
(-4 + 9t)(-4 + -9t) = 0

乘以 (-4 + 9t) * (-4 + -9t)
(-4(-4 + -9t) + 9t * (-4 + -9t)) = 0
((-4 * -4 + -9t * -4) + 9t * (-4 + -9t)) = 0
((16 + 36t) + 9t * (-4 + -9t)) = 0
(16 + 36t + (-4 * 9t + -9t * 9t)) = 0
(16 + 36t + (-36t + -81t2)) = 0

结合相似条件: 36t + -36t = 0
(16 + 0 + -81t2) = 0
(16 + -81t2) = 0

解:
16 + -81t2 = 0

求解变量 't'.

移动所有含 t 的条件放右边, 其它所有条件放左边.

增加 '-16' 到方程的每一侧.
16 + -16 + -81t2 = 0 + -16

结合相似条件: 16 + -16 = 0
0 + -81t2 = 0 + -16
-81t2 = 0 + -16

结合相似条件: 0 + -16 = -16
-81t2 = -16

两边除以 '-81'.
t2 = 0.1975308642

简化
t2 = 0.1975308642

取每边的平方根:
t = {-0.444444444, 0.444444444}

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