设这堆水果中有苹果x个,则总共有(x/45%)个水果
x/(x/45%+16)=25%
4x=x/45%+16
x=16/(4-100/45)
x=9
答:略
20个里有9个,占45%.加16个梨:9/36=1/4=25%.验算正确
不列方程的算式:16/[1/(25%) - 1/(45%)]=9
设这堆水果中有苹果x个,则总共有(x/45%)个水果
x/(x/45%+16)=25%
4x=x/45%+16
x=16/(4-100/45)
x=9
答:略
20个里有9个,占45%.加16个梨:9/36=1/4=25%.验算正确
不列方程的算式:16/[1/(25%) - 1/(45%)]=9