3M=2 ,3N=4 ,N=4/3
9M+1-2N
=3x3M + 1- 2 x N
=3 x 2 +1 -2 x (4/3)
=6 +1 -8/3
= (18+3-8)/3
=13/3
3M=2 3N=4 求9M+1-2n
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