Вычислите частное по образцу: 400: 80=(400: 10): (80: 10)= 40: 8 примеры: 800: 400 6400: 1600 16000: 800 20000: 4000 300: 50 2000: 500

800÷400=(800÷10)÷(400÷10)=80÷40; 6400÷1600=(6400÷10)÷(1600÷10)=640÷160; 16000÷800=(16000÷10)÷(800÷10)=1600÷80; 20000÷4000=(20000÷10)÷(4000÷10)=2000÷400; 2000÷500=(2000÷10)÷(500÷10)=200÷50; 300÷50=(300÷10)÷(50÷10)=30÷5.