Current location - Training Enrollment Network - Mathematics courses - In math class, Miss Wang has a math problem: When a=-2 and b=2, find the polynomial 3a cubic b cubic -7a square b-(4a cubic.
In math class, Miss Wang has a math problem: When a=-2 and b=2, find the polynomial 3a cubic b cubic -7a square b-(4a cubic.
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But I'll tell you the method: their calculation results are the same, so after merging similar items, the coefficient of odd items containing A will be 0, that is, odd items containing A will be eliminated, and such a result will only appear when it is gone. 2 and (-2), their even powers are the same.

Otherwise, Ma Xiaohu miscalculated.