—Who is teacher in your school?
—Mary is.
A:friendlier
B:friend
C:the friendliest
D:friendly
某天最低气温是﹣1℃,最高气温比最低气温高9℃,则这天的最高气温是____ ℃.
(1)计算:(7x2y3﹣8x3y2z)÷8x2y2;
(2)解分式方程:2xx+1+3x-1=2.