575.в) 1) (1/2)²=1/4; 2) 2×1/2×1/3=1/3 ;3) (1/3)²=1/9 ;4) 1/4+1/3+1/9=(9+12+4)/36=25/36. а)(1/2+1/3)²=(5/6)²=25/36. б)(1/2)²+(1/3)²=1/4+1/9=(9+4)/36=13/36. номер576: 3/5×1 2/3=3/5×5/3=1 ;1×1 2/3=5/3; 5/3×1 2/3=5/3×5/3=25/9=2 6/9=2 2/3 ; 2 2/3×1 2/3=8/3×5/3=40/9=4 4/9.