1.a+2/3+b
=a+b+2/3
=0+2/3
=2/3
2.系数是4*10五次方
3.代数式-x+2xy-3/x²是-x,+2xy,-3/x²的和,每一项的系数分别是-1,+2和-3/1
4.(1)2a和-1,系数是2和-1;
(2)2πa+3ab-4b²是2πa,+3ab,-4b²,系数是2π,+3和-4
1.a+2/3+b
=a+b+2/3
=0+2/3
=2/3
2.系数是4*10五次方
3.代数式-x+2xy-3/x²是-x,+2xy,-3/x²的和,每一项的系数分别是-1,+2和-3/1
4.(1)2a和-1,系数是2和-1;
(2)2πa+3ab-4b²是2πa,+3ab,-4b²,系数是2π,+3和-4