а) 0,3/4 = 4,2/х
х =( 0,3 * 4,2 ) / 4
х =( 1,26 ) / 4 = 0,315
б) х+1/6=5/3
х+1 = (6*3)/5
х+1 = 3,6
х = 2,6
в) 1 7/8 : 8 1/3 = х : 4/9
х = ( 4/9 * 8 1/3 ) : 1 7/8
х = ( 4/9 * 25/3 ) : 15/8
х = 100/27 : 15/8
х = 100/27 * 8/15 = 20/27 * 8/3 = 160/81 = 1 79/81
а) 0,3/4 = 4,2/х
х =( 0,3 * 4,2 ) / 4
х =( 1,26 ) / 4 = 0,315
б) х+1/6=5/3
х+1 = (6*3)/5
х+1 = 3,6
х = 2,6
в) 1 7/8 : 8 1/3 = х : 4/9
х = ( 4/9 * 8 1/3 ) : 1 7/8
х = ( 4/9 * 25/3 ) : 15/8
х = 100/27 : 15/8
х = 100/27 * 8/15 = 20/27 * 8/3 = 160/81 = 1 79/81