A=4mn-n2,B=-3m2n2,C=1-4n2,其中m=2,n=3,求A+B+C的值
1个回答
A
=4×2×3-3²
=15
B
=-3×2²×3²
=-108
C
=1-4×3²
=-35
A+B+C
=15-108-35
=-128
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