问几个初三的题（数学和英语）

1、写出下列句子的同义句
①Smoking does harm to your health.
Smoking is bad for your health .
②明镇或He feels worried about his future.
He worries about his future.
③She lost her weight from 50to55kilos .
She reduced her weight for 5 kilos.
2.我哥哥已决意辞职，自己创业。My brother decided to _resign his job and begin his own business.
3、作为一个学生，我们应该遵守学校制度.
As a student ,we should obey the school rules.
4、disadvantage of （翻译）缺点
5、”典型的学校餐”的英文_typical school meals.
6、我的腿有点疼。
My legs feel a bit ache.
7、我认为学校应该禁止垃圾食品。
I think junk food should be forbidden in schools.
8、我有一个朋友，他哥哥正在备战奥运会。
I have a friend _whose elder brother is _preparing for the Olympics.
9、He goes to school by bus every day.
He takes a bus to school every day.
10、This is Lucy’s new CD.
This new CD is for Lucy

﹙x－7﹚﹙x＋3﹚＋﹙x－1﹚﹙x＋5﹚＝102
x²＋3x－7x－21＋x²＋5x－x－5＝102
2x²－4x－21＋4x－5＝102
2x²－26＝102
2x²＝128
x²＝64
x＝±8

x＋1／x＝5／2
2x²＋2＝5x
2x²－5x＋2＝0
﹙2x－1﹚﹙x－2﹚＝0
2x－1＝0或x－2＝0
x1=1/2或x2=2
︴由 x＋y＝4得，y＝4－x
则由xy=2得，x﹙4-x﹚＝2
4x-x²=2得
x²-4x+2=0
x²-4x+4-2=0
(x-2)²-2=0
﹙x-2﹚²＝2
x-2=±√2
x=±√2＋激伍2

由y²=4x得
x²+y²=5即为x²＋4x＝5
x²＋4x-5=0
﹙x+5﹚﹙x-1﹚=0
x1=﹣5,x2=1
当x=﹣5时，由y²=4x得
y²=﹣20,显然它不存在。
∴x=﹣5不合题意，应舍去。则x=1.
当x=1时，y²=4x=4,y=±2
∴此题有两组解。x=1时，y=2.或x=1时，y=﹣2.

1／2（1-3／2x²+1／2x)=x-1／3
两边同乘以2得，1-3／2x²+1／2x=2x-2/3,
两边同旅轮乘以6得,6-9x²+3x=12x-4
9x²+9x-10=0
﹙3x－2﹚﹙3x+5﹚=0
x1=2／3,x2=﹣5／3

2)；he worried of his future.
3); she lost her weight about 5 kilos.
2 My brother decide to leave his job and begin his own business.
3 As a student, we should observe the rule of school
4 缺点
5 typical school restaurant
6 My legs feel of ache
7 be forbidden
8 who, preparing for
9 takes bus to
10 belong to

1：Smoking is harmful to health

2：He worried about his future

解方搜稿程，从左到右;x=±8 x1=1/2，x2=2 x1=2+√慧漏漏2，x2=2-√2 x1=-5，x2=1 x1=1/前烂9,x2=-10/9

not good。worried about，left at 。decided giveup。