难溶电解质A3B的饱和溶液中[A+]=x mol/L,[B3-]=y mol/L,则A3BKsp的表达式为（ ）
A: xy3
B: x(3y)
C: x3y
D: xy2
A: xy3
B: x(3y)
C: x3y
D: xy2
举一反三
- 难溶电解质AB2饱和溶液中,c(A+) = x mol/L、c(B-) = y mol/L,则Kspθ值为( ) A: xy2/2 B: xy C: xy2 D: 4x2y
- 设\(z = u{e^v}\)，\(u = {x^2} + {y^2}\)，\(v = xy\)，则\( { { \partial z} \over {\partial y}}=\)（ ）。 A: \({e^{xy}}({x}y^2 + {x^3} + 2y)\) B: \({e^{xy}}({x^2}y + {x^3} + 2y)\) C: \({e^{xy}}({x}y^2 + {x^3} + 2x)\) D: \({e^{xy}}({x}y+ {x^3} + 2y)\)
- [(x-y)^3×(√x+√y)^(-3)+3(x√y-y√x)]/(x√x+y√y)
- 设\(z = u{e^v}\)，\(u = {x^2} + {y^2}\)，\(v = xy\)，则\( { { \partial z} \over {\partial x}}=\) A: \({e^{xy}}({x^2}y + {y^3} + 2x)\) B: \({e^{xy}}({x}y^2 + {y^3} + 2x)\) C: \({e^{xy}}({x}y + {y^3} + 2x)\) D: \({e^{xy}}({x^2}y + {y^2} + 2x)\)
- 分解因式()x()3()y()-()2()x()2()y()2()+()xy()3()正确的是A.()xy()(()x()+()y())()2()B.()xy()(()x()2()﹣()2()xy()+()y()2())()C.()xy()(()x()2()+2()xy()﹣()y()2())()D.()xy()(()x()﹣()y())()2