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a+bxc=7
a-bxc=5
=>a+bxc+a-bxc=7-5
=>2a=2
=>a=1
a+b+c=6 =>b+c=5
a-bxc=-5
=>bxc=1-(-5)=6
=>b=2 c=3 hoặc b=3 c=2
=> 2(a+b+c)=113+107+100=320
a+b+c=320:2=160
a=160-107=53
b=160-100=60
c=160-113=47
đáp số : a=53 ; b=60 ;c = 47
các bn cho mk vài li-ke cho tròn 660 với
Giải:
1) a+b=c => a=c-b
b=a-c
2) a:b=c => a=c.b
b=a:c
3)a.b=c => a=c:b
b=c:a
h đúng cho mk nha!
\(\hept{\begin{cases}a+b=9\\b+c=7\\a-c=2\end{cases}}\)Mak C = 2 \(\Rightarrow\hept{\begin{cases}a+b=9\\b+2=7\\a-2=2\end{cases}}\)\(\Rightarrow\hept{\begin{cases}a=4\\b=5\\c=2\end{cases}}\)
\(\Rightarrow2ac-b=2\cdot4\cdot2-5=11\)
c =2
suy ra b =7-c =7-2 =5,a =c +2 =2+2=4
vậy 2.c.a-b=2.2.4-5=11
1. What are they doing? – They are _____ with paper boat.
A. doing
B. making
C. playing
2. Has she got any pet? – No, she_____.
A. has
B. hasn’t
C. haven’t
3. How many ______ are there in your bedroom? – There are two.
A. chair
B. chairs
C. x
4. What’s Mai doing? – She ______.
A. play cycling
B. cycling
C. cycles
5. How old is your_______? – He’s thirty-four.
A. sister
B. mother
C. father
6. What is the ---------- today?
A. activity
B. colour
C. weather
7. --------- many cats do you have?
A. Why
B. How
C. What
8. what _____ are your dogs? – They are black and white.
A. colour
B. yellow
C. sunny
9. ……………is that man? - He is my father
A. Who
B. What
C. He
D. His
10. My brother is twelve years ………
A. age
B. how
C. old
D. new
11. There ……..a garden in my house
A. be
B. is
C. are
D. aren’t
12. There is a pond ……….. front of my house.
A. in
B. off
C. to
D. of
13. ……there a garden in your house?
A. Are
B. Is
C. What
D. Where
14. The gate ……….the house is blue
A. of
B. for
C. to
D. in
15. ……… are my books? -They’re on the desk
A. What
B. Where
C. What
D. How
16. There are two pictures ………..the wall
A. in
B. above
C. on
D. to
17. There is a chair between the table……… the wardrobe
A. and
B. in
C. on
D. or
18. How……….. chairs are the in the classroom?
A. old
B. much
C. many
D. long
19. Are there …………posters on the wall?
A. any
B. a
C. one
D. the
20. Are there any chairs in the room? - No, There …………….
A. are
B. is
C. aren’t
D. isn’t
=> 3(a+b+c+d)=210+170+180+130=690
a+b+c+d=690:3=230
=> a=230-170=60
b=230-180=50
c=230-130=100
d=230-210=20
đáp số : a=60;b=50;c=100;d=20
các bn cho mk vài li-ke cho tròn 670 với
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