One way to solve: (4/5) ÷ (9/10) = (4/5) * (10/9) = 40/45, simplifies to 8/9. To divide, just multiply by the reciprocal [reciprocal of 9/10 is 10/9]
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2 r1
Nine and two thirds divided by four and five fifths = 114/15
1 tenth
It is: -3/5 divided by 9/10 = -2/3
3.8 + 2.9 = 6.7