А)1/2*2/3*3/4 б)3/8*4/5*2*3 В)1/4*2/5*10/11 Г)3/5*1/2**4/9

А ) 1 / 2 * 2 / 3 * 3 / 4 = ( 1 * 2 * 3 ) / ( 2 * 3 * 4 ) = ( 1 * 1 * 3 ) / ( 1 * 3 * 4 ) = 3 / ( 3 * 4 ) = 1 / ( 1 * 4 ) = 1 / 4 = 0 , 25 ; б) 3 / 8 * 4 / 5 * 2 * 3 = ( 3 / 4 ) / ( 8 * 5 ) * 2 * 3= ( 3 * 4 ) / ( 2 * 4 * 5 ) * 2 * 3= ( 3 * 1 ) / ( 2 * 1 * 5 ) * 2 * 3 = ( 3 * 1 ) / ( 2 * 1 * 5 ) * 6 = ( 3 ) / ( 2 * 5 ) * 6= 3 / 10 * 6 = 3 * 6 / 10 = 18 / 10 = ( 9 * 2 ) / ( 5 * 2 ) = 9 / 5 ;В) 1 / 4 * 2 / 5 * 10 / 11 = 1 / 4 * 2 / 1 * 2 / 11 = 1 / 2 * 1 / 1 * 2 / 11 = 1 / 1 * 1 / 1 * 1 / 11 = 1 / 11;Г) 3 / 5 * 1 / 2 * 4 / 9 = 1 / 5 * 1 / 2 * 4 / 3 = 1 / 5 * 1 / 1 * 2 / 3 = 2 / ( 5 * 3 ) - 2 / 15.