能说明下方法吗23^x-4=16^x x= if the difference of a number and its reciprocal is 16/15 find the number.simplify (x^3+27)/(x+3) given the following roots 3 and -2 write the quadratic equation.solve {y=5 y=2x^2
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能说明下方法吗23^x-4=16^x x= if the difference of a number and its reciprocal is 16/15 find the number.simplify (x^3+27)/(x+3) given the following roots 3 and -2 write the quadratic equation.solve {y=5 y=2x^2
能说明下方法吗
23^x-4=16^x x=
if the difference of a number and its reciprocal is 16/15 find the number.
simplify (x^3+27)/(x+3)
given the following roots 3 and -2 write the quadratic equation.
solve {y=5 y=2x^2
能说明下方法吗23^x-4=16^x x= if the difference of a number and its reciprocal is 16/15 find the number.simplify (x^3+27)/(x+3) given the following roots 3 and -2 write the quadratic equation.solve {y=5 y=2x^2
23^x-4=16^x x= ?
23^x-16^x=4
求对数
ln(23^x)-ln(16^x)=ln(4)
x*ln(23)-x*ln(16)=ln(4)
x(ln(23)-ln(16))=ln4
xln(23/16)=ln4
x=ln4/ln(23/16)
x=log1.4375(4)
如果一个数和倒数的差是16/15,请把这个数找出来.
x-1/x=16/15 整理的 15x^2-16x-15=0 整理(5x+3)(3x-5)=0 所以x=-3/5 或5/3
化简 (x^3+27)/(x+3)
x^3+27=x^3+3^3=(x+3)(x^2-3x+9)所以原式化简为x^2-3x+9(x不等于-3)
写出一个根分别为3和-2的一元二次方程.
(x-3)(x+2)=0
解决: {y=5 y=2x^2
即 2x^2=5 即有 x^2=2.5 的x=正负0.5V10