=9/8 * 98/13 *8 + 8 * 14/13 * 9/8 - 225/2 * 16/13 * 2/25 + 64/13 * 9/8=9*98/13 + 9*14/13 - 9*16/13 + 8*9/13=9/13*（98+14-16+8）=9/13*104=72
好复杂
72
12
