What's the answer to the 12 questions on page 30 of the seventh grade mathematics volume 2 of Peking University green card PEP edition?

(cubic of 28a - quadratic of 28a + 7a) / 7a, where a = 3 / 4
=Square of 4a-4a
=-0.75
（2）
=-The square of X + XY
=-14 / 3

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