Viet moi bieu thuc sau duoi dang 2binh phuong :
a; ( x+ y+4 ) .(x+y-4)
b; (x-y+6).( x+y-6)
c: ( x+2y+3z). (2y+3z-x)
Giup minh vs <3
lop8 Hang dang thuc nhaa .
viet cac bieu thuc sau duoi dang binh phuong cua mot tong hoac mot hieu
xy^2+(2+xy^2)+10-6x+x^2
CMR bieu thuc sau viet duoc duoi dang tong cac binh phuong cua hai bieu thuc
x2+2(x+1)2+3(x+2)2+4(x+3)2
Viet bieu thuc sau duoi dang binh phuong cua 1 tong:
2xy2 + x2y4 +1
\(2xy^2+x^2y^4+1\\ =\left(xy^2\right)^2+2xy^2.1+1^2\\ =\left(xy^2+1\right)^2\)
Ta có :
\(2xy^2+x^2y^4+1=\left(xy^2\right)^2+2.xy^2.1+1^2\)
\(=\left(xy^2+1\right)^2\)
Viet moi bieu thuc sau ve dang tong hoac hieu 2 binh phuong:
a) (x+y+4)(x+y-4)
b)(x-y+6)(x+y-6)
a) \(\left(x+y+4\right)\left(x+y-4\right)=\left(x+y\right)^2-4^2\)
b)\(\left(x-y+6\right)\left(x+y-6\right)=\left[x-\left(y-6\right)\right]\left(x+y-6\right)=x^2-\left(y-6\right)^2\)
\(a,\left(x+y+4\right)\left(x+y-4\right)\)
\(=\left(x+y\right)^2-4^2\)
\(b,\left(x-y+6\right)\left(x+y-6\right)\)
\(=x^2-\left(y-6\right)^2\)
Viet moi bieu thuc sau ve dang tong hoac hieu 2 binh phuong:
a) (x+y+4)(x+y-4)
b)(x-y+6)(x+y-6)
\(\left(x+y+4\right)\left(x+y-4\right)\)
\(=\left(x+y\right)^2-4^2\)
\(\left(x-y+6\right)\left(x-y-6\right)\)
\(=\left(x-y\right)^2-6^2\)
viet cac bieu thuc sau duoi dang tich: x^3 y^3+225
\(x^3y^3+125=\left(xy+5\right)\left(x^2y^2-5xy+25\right)\)
Viet bieu thuc sau duoi dang 1 luy thua5^12*7-5^11*10
5^12*7-5^11*10
=5^11*(5x7-10)(mjk đặt 5^11 làm ts chung)
=5^11x25=5^11 x 5^2=5^13
viet cac bieu thuc sau duoi dang tong:
a,(-3x+2)\(^3\)
\(a,\left(-3x+2\right)^3\)
\(=\left(2-3x\right)^3\)
\(=2^3-3.2^2.3x+3.2.9x^2-27x^3\)
\(=8-36x+54x^2-27x^3\)
viet cac bieu thuc sau duoi dang tong:
a,(-3x+2)\(^3\)
\(a,\left(-3x+2\right)^3=\left(2-3x\right)^3=2^3-3.2^2.3x+3.2.9x^2-27x^3=8-36x+54x^2-27x^3\)