在()里填上最简分数。4K5l5r6O
25秒=:F6b2N+P-R5g'K2d/e9K5j分4K5l5r6O
30厘米=.n4o*X(J8w+U米4K5l5r6O
250千克=5l,Y8p/l8Z6Y7?.N6e吨4K5l5r6O