576 nha bạn 

tim x,y biet:

3lx-2l-lx+1l=x+5

lx-2l+lx+2l=4-y^2 với x,y thuộc Z.

cho a+b+c/d=b+c+d/a=c+d+a/b=d+a+b/c

vs a,b,c,d khác 0.

TÝnh M=(a+b).(b+c)/(c+d).(a+d)

tìm x,y,z biết:

a,3lx+2l-lx+1l=x+5

b,lx-2l+lx+2l=4-y^2 với x,y thuộc Z.

tìm x,y,x biết:
a.3x=4y=5z và x+y+z=49

b. 4x/3=2y/5=3z/4 và(2x-y)^4 +2(y-2z)^4=113

dùng từ gợi ý viết thành câu:

1.I/please/that/you/your/family/well.

2.Here/photo/my family/my parents/sister Mien/ me.

3.Let/tell/you/my family.

4.Father/mechanic/and/work/factory.

5He/work/five days/week/about/40 hours.

6.In/free time/he/often/play basketball.

7.Mother/teacher/primary school/near/house.

8.She/go/school/morning/and/free/afternoon/

9.So she/have/lot/time/take care/house/look after/us.

10.sister Mien/16/and/she/grade 11.

11.she/very good/Maths/and/English.

12.Please/write/me/soon/and/tell/more/my family.