1) 3/4+2/3:4/9-1/5= 2)6/50=9/a a=.......

1

=(3/4+2/3):(4/9 -1/5)
=(9/12 +8/12) : (20/45 - 9/45)
=17/12 :11/45
=17/12 × 45/11
=765/132

2

6/50=9/a
6a=50×9
6a=450
a =450/6
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