Question

若3a+2b=-1,求9(a 1/9b)-3(a-b) 2的值

Answer 1

9(a 1/9b)-3(a-b) 2
=9a+b-3a+3b+2
=6a+4b+2
=2(3a+2b)+2
=2×(-1)+2
=0;
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