24/25×9/56×5/24×7/9用简便方法计算。=24/25x5/24x9/56x7/9=5/25x7/56=1/5x1/8=1/40
24/25×9/56×5/24×7/9=（24/25×5/24）×（9/56×7/9）=1/5×1/8=1/40
