giai dum mik !!
phan tich da thuc thanh nhan tu
x^2 + 4y^2 +3x - 6y
giai dum mik vs
\(x^2+4y^2+3x-6y=\left(x^2+3x\right)-\left(4y^2+6y\right)=x\left(x+3\right)-2y\left(2y+3\right)\)
hieu hai so la 379 neu xoa chu so 1 ben phai so lon ta duoc so be
so be la
giai dum mik nka :))
giai dum mik nghe
*81* chia het cho 2,3,5,9 (trong mot so co nhieu dau * ,cac dau * khong nhat thiet phai thay boi cac chu so giong nhau )
mong cac ban giai dum mik bai toan nay lam gap nha may ban ai lam dung mik se tick
nek ban ban co thay ko
giai bai toan duoi dang luy thua dum em:
2.2.2.3.3=??? giup dum e
cac giai giai dum` minh cau 12,13 nha cam on may b
13:
\(S_{ABC}=\dfrac{1}{2}\cdot AB\cdot AC\cdot sinBAC=\dfrac{1}{2}\cdot5\cdot8\cdot\dfrac{\sqrt{3}}{2}=\dfrac{4\sqrt{3}}{2}\cdot5=10\sqrt{3}\)
Xét ΔABC có \(cosA=\dfrac{AB^2+AC^2-BC^2}{2\cdot AB\cdot AC}\)
=>\(5^2+8^2-BC^2=2\cdot5\cdot8\cdot cos60=40\)
=>BC^2=49
=>BC=7
S=pr
=>r*(5+8+7)/2=10căn 3
=>r=10căn 3/10=căn 3
Xét ΔABC có
BC/sinA=2R
=>2R=7:sin60=7*2/căn 3
=>R=7/căn 3
giai dum nhanh di
giai dum di
giai 8,3m= cm viet ra cach giai dum nhe
vì m gấp cm 100 lần nên muốn ra cm chỉ cần lấy 8,3 x 100