Cho hệ pt :
ax+by =3
ax2+by2=5ax2+by2=5
ax3+by3=9ax3+by3=9
ax4+by4=17ax4+by4=17
Tính
ax5+by5,ax2013+by2013=?ax5+by5,ax2013+by2013=?
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1.__________ is your telephone number?
A. When B. Which C. What D. Why
2.Nga lives ________ 52 Nguyen Dinh Chieu street.
A. at B. on C. in D. by
3.Her birthday party is _______ Friday, August 20th
A. at B. on C. in D. by
4.________ you have a test tomorrow morning?
A. Will B. do C. are D. does
5.__________ is your brother?
A. How age B. What age C. How old D. B&C are correct
6.Nhat _______ 9 years old on his next birthday
A. is B. will C. will be D. isn’t
7.When's your______?
A. birthday B. day of birth C. date of birth D. birthdate
8.Ba: Will he be free on Sunday? Nam:______A.
A. No, he won't B. No, he doesn't C. No.he isn't D. No, he will
9.White is the color Hoa likes ____________.
A. most B. good C. favorite D. more than
10.What's your______?
A. date of birth B. birthdate C. birthday D. day of birth
11.An: Will you be free tomorrow evening?Hoa:______
A. Yes, I will B. Yes, I do C. Yes, I am D. Yes, I won't
12.Ba: Where will we meet?-Nam:______ the movie theater.
A. In front B. Next C. In front of D. Before
13.When does our new school year begin ? –It’s in ___________.
A August B. September, 5th C. Monday, September D. Thursday
14.Lan will _______some of her friends to her birthday party.
A. tell B. meet C. invite D. see
15.The party will start at 6.00 P.M and_______ at 9.00 P.M
A. finish B. finishes C. finishing D. to finish
`ab(x-3) -a^2(x-3)`
`=(x-3)(a^2-ab)`
__
`ax+ay+bx+by`
`=a(x+y)+b(x+y)`
`=(x+y)(a+b)`
__
`ax+ay -2x-2y`
`=(ax+ay)-(2x+2y)`
`=a(x+y)-2(x+y)`
`=(x+y)(a-2_`
__
`2x-2y +ax-ay`
`=2(x-y)+a(x-y)`
`=(x-y)(2+a)`
__
`10ax -5ay -2x+y`
`= 5a(2x-y) -(2x-y)`
`=(2x-y)(5a-1)`
1: =(x-3)(ab-a^2)
=a(b-a)(x-3)
2: =a(x+y)+b(x+y)
=(x+y)(a+b)
3: =a(x+y)-2(x+y)
=(x+y)(a-2)
4: =2(x-y)+a(x-y)
=(x-y)(a+2)
5: =5a(2x-y)-(2x-y)
=(2x-y)(5a-1)
A x 7 + A x 9 - A - A x 5 = 290
A x 7 + A x 9 - A x 1 - A x 5 = 290
A x ( 7 + 9 - 1 - 5 ) = 290
A x 10 = 290
A = 290 : 10 = 29
A x 7 + A x 9 - A - A x 5 = 290
A x 7 + A x 9 - A x 1 - A x 5 = 290
A x ( 7 + 9 - 1 - 5 ) = 290
A x 10 = 290
A = 290 : 10
A = 29
a×4+35+a×6=a×5+a×10
⇔a×4+a×6-a×5-a×10=-35
⇔a×(4+6-5-10)=-35
⇔a×(-5)=-35
⇔a=-35:(-5)
⇔a=7
Vậy a=7.