写代数式
A.xy | B.10x+y | C.1000x+y | D.100x+1000y |
A.yx | B.x+y | C.10y+x | D.10x+y |
A.ab | B.a+b | C.10a+b | D.10ab |
A.![]() |
B.![]() |
C.![]() |
D.![]() |
A.14.2a元 | B.1.42a元 | C.1.142a元 | D.0.142a元 |
A.10a+100b | B.ba | C.100ba | D.100b+a |