tolong jwb ya...untuk bsk

a.1/3×4/5=4/15÷16/9=4/15×9/16=36/240=3/20
b.8/3÷4/9=6×15/9=10

-maaf klo salah

(2.)a.2/7:4/5=2/7×5/4=10/28=5/14.
(3.)a.1/3×4/5:16/9=1/3×4/5×9/16=36/240.
(3.)b.2⅔:4/9×1 6/9=8/3:4/9×15/9=8/3×9/4×15/9=1.080/108=10.
(4.)C.½×1⅓+2/9:10/6=½×4/3+2/9:10/6=½×4/3+2/9×6/10=4/6+12/90=144/180=4/5.