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\(1,=\left(x+2\right)^2\\ 2,=\left(4-x\right)^2\\ 3,=\left(x+3y\right)^2\\ 4,=\left(2x-1\right)^2\\ 5,=\left(3-y\right)^2\\ 6,=\left(1-y\right)^2\\ 7,=\left(3x+2y\right)^2\\ 8,=-\left(y-5\right)^2\\ 9,=x^2+98=???\)
4:
h: -(x-9)(2x-1)
=-(2x^2-x-18x+9)
=-2x^2+19x-9
k: -(2x+3)(x-7)
=-(2x^2-14x+3x-21)
=-2x^2+11x+21
l: -(6x+1)(5x-9)
=-(30x^2-54x+5x-9)
=-30x^2+49x+9
m: =(2x-5)(7x-3)
=14x^2-6x-35x+15
=14x^2-41x+15
n: =(6x-8)(x-9)
=6x^2-54x-8x+72
=6x^2-62x+72
5:
a: \(=2x^3-2x^2+2x+3x^2-6x+24x-48-5x-5\)
=2x^3+x^2+15x-5
b: \(=4x^2+20x+2x^2+14x-6x-42-15x+27\)
=6x^2+13x-15
c: \(=-7x^2+14x+2x^2-4x+10x-20-3x^2+3x\)
=-8x^2+23x-20
1)
a) 4y2-4xy+x2= x2-4xy+4y2= (x-2y)2
b) 9x2-12xy+4y2= (3x)2-2.3x.2y+(2y)2= (3x-2y)2
c) 16x2-25=(4x)2-52= (4x-5)(4x+5)
d) 1-9y2= 12-(3y)2=(1-3y)(1+3y)
g) x3-27y3= (x-3y)(x2+3xy+9y2)
h) 64 + 8x3=(4+2x)(16+8x+4x2)
Tứ giác PQRS có:
∠P + ∠Q + ∠R + ∠S = 360⁰ (tổng các góc trong tứ giác PQRS)
x + x + 95⁰ + 65⁰ = 360⁰
2x + 160⁰ = 360⁰
2x = 360⁰ - 160⁰
2x = 200⁰
x = 200⁰ : 2
x = 100⁰
2:
a: =3x^2-3xy-(5x-5y)
=3x(x-y)-5(x-y)
=(x-y)(3x-5)
b: =6x(2x-y)-3y(2x-y)
=(2x-y)(6x-3y)
=3(2x-y)^2
c: =x(a-b)-y(a-b)
=(a-b)(x-y)
d: =x^2(a-b)-y^2(a-b)
=(a-b)(x^2-y^2)
=(x-y)(x+y)(a-b)
e: \(=6y\left(2x^2-3xy-5y^2\right)\)
=6y(2x^2-5xy+2xy-5y^2)
=6y[x(2x-5y)+y(2x-5y)]
=6y(2x-5y)(x+y)
f: =5x(x-y)-10(x-y)
=(x-y)(5x-10)
=5(x-2)(x-y)
g: =3x-4x+3y-4y
=-x+y
h: =7x(x-y)+(x-y)
=(x-y)(7x+1)
k: =(5x)^2-(3x+3y)^2
=(5x-3y-3x)(5x+3x+3y)
=(8x+3y)*(2x-3y)
Bạn ơi thiếu 4 ý nx ạ :))