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1: \(x^4-4+2x^3-4x\)
\(=\left(x^2-2\right)\left(x^2+2\right)+2x\left(x^2-2\right)\)
\(=\left(x^2-2\right)\left(x^2+2x+2\right)\)
4: \(-6x^3+18x^2+60x\)
\(=-6x\left(x^2-3x-10\right)\)
\(=-6x\left(x-5\right)\left(x+2\right)\)
6: \(x^4+x^3-5x^2-5x\)
\(=x\left(x^3+x^2-5x-5\right)\)
\(=x\left(x+1\right)\left(x^2-5\right)\)
1)
\(6x^2+12xy+6y^2\)
\(=6(x^2+2xy+y^2)=6[(x^2+xy)+(xy+y^2)]\)
\(=6[x(x+y)+y(x+y)]=6(x+y)^2\)
2)
\(-3x^4y^2-6x^3y^2-3x^2y^3\)
\(=-3x^2y^2(x^2+2x+y)\)
3) \(-3x^4y-12x^2y-12x^2y\)
\(=-3x^4y-24x^2y\)
\(=-3x^2y(x^2+8)\)
4)
\(5x^4y^2+20x^3y^2+20x^2y^2\)
\(=5x^2y^2(x^2+4x+4)\)
\(=5x^2y^2[x^2+2x+2x+4]\)
\(=5x^2y^2[x(x+2)+2(x+2)]=5x^2y^2(x+2)^2\)
5)
\(4x^5y^2-8x^4y^2+4x^3y^2\)
\(=4x^3y^2(x^2-2x+1)\)
\(=4x^3y^2(x^2-x-x+1)\)
\(=4x^3y^2[x(x-1)-(x-1)]=4x^3y^2(x-1)^2\)
a) \(\left(x^2-2xy+y^2\right).\left(x-y\right)\)
\(=\left(x-y\right)^2.\left(x-y\right)\)
\(=\left(x-y\right)^3\)
\(=x^3-3x^2y+3xy^2-y^3.\)
b) \(\left(30x^4y^3-25x^2y^3-4x^4y^4\right):5x^2y^2\)
\(=\left(30x^4y^3:5x^2y^2\right)-\left(25x^2y^3:5x^2y^2\right)-\left(4x^4y^4:5x^2y^2\right)\)
\(=6x^2y-5y-\frac{4}{5}x^2y^2.\)
Chúc bạn học tốt!
Bài 1:
a)\(5x^2y^3-25x^3y^4+10x^3y^3=5x^2y^3\left(1-5xy+2x\right)\)
b)\(x^3-2xy-x^2y+2y^2=\left(x^3-x^2y\right)-\left(2xy-2y^2\right)=x^2\left(x-y\right)-2y\left(x-y\right)=\left(x-y\right)\left(x^2-2y\right)\)
c)Đề sai hoàn toàn
d) \(2x^2+4xy+2y^2-8z^2=2\left(x^2+2xy+y^2-4z^2\right)=2\left[\left(x+y\right)^2-\left(2z\right)^2\right]=2\left(x+y-2z\right)\left(x+y+2z\right)\)e) \(3x-3a+yx-ya=3\left(x-a\right)+y\left(x-a\right)=\left(x-a\right)\left(3+y\right)\)
f)\(\left(x^2+y^2\right)^2-4x^2y^2=\left(x-y\right)^2\left(x+y\right)^2\)
g)\(2x^2-5x+2=2x^2-x-4x+2=x\left(2x-1\right)-2\left(2x-1\right)=\left(2x-1\right)\left(x-2\right)\)
i)\(14x\left(x-y\right)-21y\left(y-x\right)+28z\left(x-y\right)=14x\left(x-y\right)+21y\left(x-y\right)+28z\left(x-y\right)=7\left(x-y\right)\left(2x+3y+4z\right)\)
1, -3x4y + 6x3y - 3x2y
= -3x2y (x2 - 2x + 1)
= -3x2y(x - 1)2
2, 12x2 - 12xy + 3y2
= 3(4x2 - 4xy + y2)
= 3(2x - y)2
3, 20x4y2 - 20x3y3 + 5x2y4
= 5x2y2(4x2 - 4xy + y2)
= 5x2y2(2x - y)2
4, 16x5y2 - 16x4y3 + 4x3y4
= 4x3y2(4x2 - 4xy + y2)
= 4x3y2(2x - y)2
5, -12x4y + 12x3y2 - 3x2y3
= -3x2y(4x2 - 4xy + y2)
= -3x2y(2x - y)2
6, (a2 + 4)2 - 16a2
= (a2 + 4 - 4a)(a2 + 4 - 4a)
7, (a2 + 9)2 - 36a2
= (a2 + 32)2 - (6a)2
= (a2 + 32 - 6a)(a2 + 32 + 6a)
= (a2 - 6a + 9)(a2 + 6a + 9)
8, (a2 + 4b2)2 - 16a2b2
= (a2 + 4b2 - 4ab)(a2 + 4b2 + 4ab)
= (a2 - 4ab + 4b2)(a2 + 4ab + 4b2)
= (a - 2b)2(a + 2b)2
= (a2 - 4b2)4
Câu này có sai thì bạn thông cảm nhá!!!
9, 36a2 - (a2 + 9)2
= (6a)2 - (a2 + 9)2
=- (a2 - 6a + 9)(a2 + 6a + 9)
= -(a - 3)2(a + 3)2
= -(a2 - 9)4
Câu 10 giống câu 8 bạn nhé
Bài 2:
a: \(A=\left(2x-y\right)^2=\left(12-2\right)^2=100\)
b: \(=\left(x-3\right)^3=100^3=1000000\)
c: \(=\left(x-y\right)^2-9z^2\)
\(=\left(x-y-3z\right)\left(x-y+3z\right)\)
\(=\left(6+4-90\right)\left(6+4+90\right)=-80\cdot100=-8000\)
-3x4y -12x2y -12x2
= -3x2(x2y+4y+4)
4x5y2+16x4y2+16x3y2
= 4x3y2(x2+4x+4)
= 4x3y2(x+2)2
5x4y2+20x3y2+20x2y2
= 5x2y2(x2+4x+4)
= 5x2y2 (x+2)2
7x2-14x+7
= 7(x2-2x+1)
= 7(x-1)2
\(20x^2y-12x^3=4x^2\left(5y-3x\right)\)
\(8x^4+12x^2y^4-16x^3y^4=4x^2\left(2x^2+3y^4-4xy^4\right)\)
\(6x^3-9x^2=3x^2\left(2x-3\right)\)
\(4xy^2+8xy^2=12xy^2\)
\(3x\left(x+1\right)-5\left(x+1\right)=\left(3x-5\right)\left(x+1\right)\)
\(20x^2y-12x^3\)
\(=4x^2\left(5y-3x\right)\)
\(8x^4+12x^2y^4-16x^3y^4\)
\(=4x^2\left(2x^2+3y^4-4xy^4\right)\)
a) (24x\(^4\)y\(^3\)- 30\(x^5y^2\)- 6 \(x^6y^3\)) : 6\(x^4y^2\)
= (24\(x^4y^3\): 6\(x^4y^2\)) - (30\(x^5y^2\): 6\(x^4y^2\)) - (6\(x^6y^3\): 6\(x^4y^2\))
= 4y - 5x - x\(^2\)y
b) (x-3)(x+3)- (x-2)(x+1)
= x\(^2\)- 9 - (x\(^2\)+x-2x-2)
= x\(^2\)- 9 (x\(^2\)- x -2)
= x\(^2\)- 9 -x\(^2\)+ x+2
= -7+x
thực hiện phép tính nha :))
Đáp án
= 6x^2 - 4 + 6/5x^2y
Giải thích các bước giải
(30x4y3−20x2y3+6x4y4):(5x2y3)(30x4y3−20x2y3+6x4y4):(5x2y3)
=(30x4y3:5x2y3)−(20x2y3:5x2y3)+(6x4y4:5x2y3)=(30x4y3:5x2y3)−(20x2y3:5x2y3)+(6x4y4:5x2y3)
=6x2−4+65x2y