4. Multiplicative identity is ____.2. – 17 / 19 x ____ = 1. 5. Simplify 2 / 5 + 3 / 7 + (- 6 / 5) + (-13 / 7).
6. Verify that 2 / 3 x [ 5 /6 + 7 / 8] = [ 2 / 3 x 5 / 6] + [ 2 / 3 x 7 / 8].
7. Multiply the reciprocals of - 2 / 3 and 5 / 6.
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