勾股定理数学中考题已知:125x=1000 8y=1000 (x和y均为指数) 求:(X+Y)÷(XY)的值
2019-06-24
勾股定理数学中考题
已知:125x=1000 8y=1000 (x和y均为指数)
求:(X+Y)÷(XY)的值
优质解答
a的b次幂用a^b表示.
125^x=1000,125^(xy)=1000^y......(1)
8^y=1000,8^(xy)=1000^x..........(2)
(1)(2)相乘,得1000^(xy)=1000^(x+y),
xy=x+y,(X+Y)÷(XY)=1.
a的b次幂用a^b表示.
125^x=1000,125^(xy)=1000^y......(1)
8^y=1000,8^(xy)=1000^x..........(2)
(1)(2)相乘,得1000^(xy)=1000^(x+y),
xy=x+y,(X+Y)÷(XY)=1.