2016???????????????????
????????????10??С?????3?????30??????????????????
1. ?????????? ??
A. B. C .- D.?????????
2?????+30m???????30m???????????40m????????????
?? A?? +40m B?? +30m C????40m D?? ??30m
3???????a??b????a+b=5??a2b+ab2=??10????ab????????????
?? A????2 B?? 2 C??50 D????50 |