1.(1) 2a3b;
(2) 1/3xy;
(3) 3n;
(4) 4/3x3y.
2.(1) 3x+1;
(2) a+b+c;
(3) -3+1/2cd2;
(4) 4/7x+3/7y.
试卷导航 1.(1) 2a3b;
(2) 1/3xy;
(3) 3n;
(4) 4/3x3y.
2.(1) 3x+1;
(2) a+b+c;
(3) -3+1/2cd2;
(4) 4/7x+3/7y.
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