解方程．
|
（1）x+
=5，7 12
x+
-7 12
=5-7 12
，7 12
x=4
；5 12
（2）x÷0.5=5.2，
x÷0.5×0.5=5.2×0.5，
x=2.6；
（3）x-0.2=5.6，
x-0.2+0.2=5.6+0.2，
x=5.8；
（4）33x=1.3+2，
33x=3.3，
33x÷33=3.3÷33，
x=0.1；
（5）15-x=2.4，
15-x+x=2.4+x，
15=2.4+x，
15-2.4=24+x-2.4，
x=12.6．
（6）x+
=1 4
，3 5
x+
-1 4
=1 4
-3 5
，1 4
x=
．7 20
请先阅读下面短文，掌握其大意，然后从方框所给的词中选出最恰当的10个，用其适当形式填空。
What’s going on in 小题3:__________ countries? How do people live in places far away? Is there a good sports game somewhere? What’s living in the deepest（最深的）part 小题4:___________the sea? If you want 小题5:__________ these and other kinds of questions, just turn 小题6: _______ the TV. You can see a lot and learn a lot. Of course, people can also learn through reading or 小题7:__________ to the radio. But with TV they can learn better and more easily. Why? Because they can小题8:______________ and watch, too. TV helps to open our eyes. TV also helps us to open our minds. TV often gives 小题9:_____________ new ideas. We learn newer and better ways of doing something that can be 小题10:_____________on TV. |