一道数学题,比较大小的.two successive discounts of 20 percent and 40 percent are equivalent to a single discount of x percent.比较 x 和 52.相等)

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一道数学题,比较大小的.two successive discounts of 20 percent and 40 percent are equivalent to a single discount of x percent.比较 x 和 52.相等)

一道数学题,比较大小的.two successive discounts of 20 percent and 40 percent are equivalent to a single discount of x percent.比较 x 和 52.相等)
一道数学题,比较大小的.
two successive discounts of 20 percent and 40 percent are equivalent to a single discount of x percent.比较 x 和 52.
相等)

一道数学题,比较大小的.two successive discounts of 20 percent and 40 percent are equivalent to a single discount of x percent.比较 x 和 52.相等)
可以理解成如果一个东西先降价20%再降价40%后的价钱,与一次性降价X%的价钱相等,那X是多少.
(1-20%)*(1-40%)=1-X%
所以X=52