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a.(b-c)+c.(a-b)
= ab - ac + ac - bc
= ab - bc
= b(a - c)
a.(b-c)-b.(a+c)
= ab - ac - ba - bc
= -ac - bc
= -c(a + b)
a.(b+c)-b.(a-c)
= ab + ac - ba + bc
= ac + bc
= c(a + b)
không cần k đâu bạn à
A2=b.(a-c)-c.(a-b)
A2= ba - bc - ca + cb
A2 = ( ba - ca ) + ( bc - cb )
A2 = a. ( b - c ) + 0
Với a = -20 , b-c = -5 thì:
A2 = a. ( b - c )
A2 = -20 . ( - 5 )
A2 = 100
Ta có : 100 = 10 . 10
\(\Rightarrow\)A = 10.
Vậy A = 10
~ HOK TỐT ~
Có b - c = ( - 5 )<=>\(b=c-5\)
Thay \(a=-20\),\(b=c-5\)vào \(A\)ta có
\(A^2=\)\(\left(c-5\right)\left(-20-c\right)-c\left(-20-c+5\right)\)
\(=-20c-c^2+100+5c-c\left(-15-c\right)\)
\(=100-15c-c^2+15c+c^2\)\(=100\)
\(\Rightarrow A=10\)hoặc \(A=-10\)
Xy-3x=-19
=> x(y - 3) = -19
| x | -1 | 1 | -19 | 19 |
| y-3 | 19 | -19 | 1 | -1 |
| y | 22 | -16 | 4 | 2 |
Xy+3x-2y=11
=> x(y + 3) - 2y - 6 = 5
=> x(y + 3) - 2(y + 3) = 5
=> (x - 2)(y + 3) = 5
xét bảng như câu a nha
3x+4y-xy=16
=> x(3 - y) - 12 + 4y = 4
=> x(3 - y) -4(3 - y) = 4
Xy+3x+2y=-3
=> x(y + 3) + 2y + 6 = 3
=> x(y + 3) + 2(y + 3) = 3
=> (x + 2)(y + 3) = 3
Dịch:
1. I need more books than you
2. Hoa have more friends than me
3. Minh swim fastest
4. My mother have most clothes in the house
5. I don't speak English as good as Hoa
k mk nha
I have more book than you
Hoa has more friend than me
Minh swim fasttest
My mom has more clothes than everyone in my family ( câu này có vẻ không đúng lắm )
I don't good at English Nga
Sao cậu ko lên google dịch mà làm
1:I have more book than you
2:Hoa has more friend than me
3:Minh swim fasttest
4:My mother has the best clothes(câu này hình như sai thì phải )
5:I don't good at English Nga
1.I NEDD MORE BOOK THAN YOU
2.HOA HAVE MANY FRIENDS THAN MY
3.MINH FASTEST SWIMING
4.MOTHER HAVE MOST CLOTHES
5.I'M NOT SPEAK ENGLISH AS HOA
6.K CHO MK NHA
i need more books than you
hoa more you than me
minh fastest swim
my mother has the best clothes
i don not speak English as good as