回答:
说明:
#“最初的陈述是”Lpropasqrtb#
#“转换为等式乘以k常数”#
#“变异”#
#rArrL = kasqrtb#
#“找到k使用给定的条件”#
当“a = 8”和“b = 9#”时,#L = 72“
#L = kasqrtbrArrk = L /(asqrtb)= 72 /(8xxsqrt9)= 72/24 = 3#
#“方程式”是颜色(红色)(条形(ul(|颜色(白色)(2/2)颜色(黑色)(L = 3asqrtb)颜色(白色)(2/2)|)))#
#“当”a = 1/2“和”b = 36“#
#L = 3xx1 / 2xxsqrt36 = 3xx1 / 2xx6 = 9#
#COLOR(蓝色)“-------------------------------------------- -----------“#
# “同样” #
#Y = KX ^ 3sqrtw#
当“x = 2”和“w = 16#时,#y = 128”
#K = Y /(X ^ 3sqrtw)= 128 /(8xx4)= 128/32 = 4#
#“方程式”是颜色(红色)(条形(ul(|颜色(白色)(2/2)颜色(黑色)(y = 4x ^ 3sqrtw)颜色(白色)(2/2)|)))#
#“when”x = 1/2“和”w = 64#
#Y = 4XX(1/2)^ 3xxsqrt64 = 4xx1 / 8xx8 = 4#
假设当x = 3时,y与x和y = 24成反比变化,当y = 36时,你如何找到x?
Y = 1 / x y = k1 / x 24 = k1 / 3 72 = k y = 72 1 / x 36 = 72 1 / x 0.5 = 1 / x 0.5x = 1 x = 2答案为2。
什么是-a ^ {2} + 4a b - b ^ {2}如果a = 2且b = -6?
-88-a ^ 2 + 4ab-b ^ 2使用a = 2且b = -6: - (2)^ 2 + 4(2)( - 6) - ( - 6)^ 2 = -4-48- 36 =颜色(绿色){ - 88}
Y作为x的立方和w的平方根共同变化,当x = 2且w = 16时,Y = 128.当x = 1/2且w = 64时,找到Y?附:谢谢你帮我解决这个问题。
假设y作为x的立方和w的平方根共同变化,y = ax ^ 3xxsqrtw .....(1),其中变化常数当等式x = 2且w = 16时再次插入y = 128 (1)128 = axx2 ^ 3xxsqrt16 => 128 = axx8xx4 => a = 4现在等式(1)变为y = 4x ^ 3xxsqrtw插入x = 1/2和w = 64我们得到y = 4(1/2) ^ 3xxsqrt64 => y = 4xx1 / 8xx8 = 4