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(2a+6)的平方+|0.25b-200|+|c+1|=0這是非負數相加,那每一項都是0,所以(2a+6)的平方=0,a=-3;|0.25b-200|=0,b=800;|c+1|=0,c=-1.3a+2b+9c=-9+1600-9=1582
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