将方程3x-2y=1变形成用y的代数式表示x,则x =___________.
要用含y的代数式表示x,就是把方程变形为x=ay+b(a,b为常数),所以一般要先移项,再系数化1.
On the whole, this passage is positioned to dwell on ______.
A.the overall picture of the HDTV sector
B.how the giant TV makers should offer better products
C.a lament over consumers' inability to use a high-end TV set
D.a criticism of the TV makers for doing nothing about a big problem
古生物学研究的只是地史时期古生物的分布情况。()