№370
1) 2 1/4 : 2 = 9/4 * 1/2 = 9/8 = 1 1/8 ч.
2) 2 1/4 : 2 7/10 = 9/4 * 10/27 = (1*5)/(2*3)= 5/6 ч.
3) 2 1/4 : 3= 9/4 * 1/3 = ( 3*1)/(4*1)= 3/4 ч.
4) 2 1/4 : 3 3/4 = 9/4 * 4/15= (3*1)/(1*5) = 3/5 ч.
5) 2 1/4 : 4 1/2 = 9/4 * 2/9 = (1*2)/(4*1) = 1/2 ч.
6) 2 1/4 : 5 5/8 = 9/4 * 8/45 = (1*2)/ (1*5) = 2/5 ч.