解方程：1、37/60 ÷ x = 11/20x = 37/60 ÷ 11/20 x = 37/60 × 20/11 x = 37/332、12÷x = 7/2x = 12 ÷ 7/2 x = 12× 2/7 x = 24/73、x × 81/4 = 15/2x = 15/2 ÷ 81/4 x = 15/2 × 4/81 x = 10/271、一辆汽车3/4分钟能行驶5/8千米,这辆汽车1分钟能行驶多少千米?半小时呢?每分钟行驶：5/8 ÷ 3/4 = 5/6 (千米)半小时行驶：5/6 ×30 = 25 (千米)2一台饲料粉碎机1/4小时粉碎饲料1/8吨,这台饲料粉碎机1小时能粉碎饲料多少吨?1/8 ÷ 1/4 = 1/2 (吨) 解方程：1、37/60 ÷ x = 11/20x = 37/60 ÷ 11/20 x = 37/60 × 20/11 x = 37/332、12÷x = 7/2x = 12 ÷ 7/2 x = 12× 2/7 x = 24/73、x × 81/4 = 15/2x = 15/2 ÷ 81/4 x = 15/2 × 4/81 x = 10/271、一辆汽车3/4分钟能行驶5/8千米,这辆汽车1分钟能行驶多少千米?半小时呢?每分钟行驶：5/8 ÷ 3/4 = 5/6 (千米)半小时行驶：5/6 ×30 = 25 (千米)2一台饲料粉碎机1/4小时粉碎饲料1/8吨,这台饲料粉碎机1小时能粉碎饲料多少吨?1/8 ÷ 1/4 = 1/2 (吨)