如图,用火柴棍拼成一个由三角形组成的图形,拼第一个图形共需要3根火柴棍,拼第二个图形共需要5根火柴棍;拼第三个图形共需要7根火柴棍;……照这样拼图,则第n个图形需要___________根火柴棍.
菱形ABCD中,对角线AC=10,BD=24,则菱形的高等于___________.
—________ you help me with my spoken English?
—No problem.
—______ you please take the dog for work?
—OK, but I have tofold the clothes first.