Tính:
a) 2x2.(5x3 -4x2y -7xy +1)
b) (5x -2y)(x2 -xy +1)
c) (1/2x -1)(2x -3)
d) (x +3y)2
e) (3x -2y)2
g) (1/4x - 3x)(1/4x +3y)
f) (2x +3)3
h) (3 -2y)3
1/rút gọn biểu thức
a)(x-4)^3 - 2x(x-5)^2 + (x-4)(x^2+4x+16)-(x-3)^3
b)(x+5)(x^2-5x+25)-(x+3)^3+(x-2)(x^2+2x+4)-(x-1)^3
c)(x+3y)^3 +(3x+2y)(9x^2-6xy+4y^2)-3(2x-y)^3
d)(3x+y)^3-(5x-y)(25x^2+5xy+y^2)+(x+2y)^3
cảm ơn mn ạ
TÌM GTNN CỦA BIỂU THỨC
1. A= 3x2+5x-1
2. A= 3x2 +5x-2
3. A= 2x2+3x+4
4. A=2x2+7x
5. A= 3x2+5x
6. A= 10x2+30x+100
7. A=( x-1)(x+2)(x+3)(x+6)
8. A=x2-4x+y2-8y+6
1)rút gọn
a) (x+5)(\(x^2\) - 5x + 25) - \(\left(x+3\right)^3\) + (x-2)(\(x^2\) + 2x + 4) - \(\left(x-1\right)^3\)
b)\(\left(x+3y\right)^3+\left(3x+2y\right)\left(9x^2-6xy+4y^2\right)-\left(2y-3x\right)^3\)
c)\(\left(3x+y\right)^3-\left(5x-y\right)\left(25x^2+5xy+y^2\right)+\left(x+2y\right)^3\)
2)tìm x,biết
a)\(\left(x-1\right)^2-\left(x-2\right)\left(x+3\right)+\left(x+2\right)^3=\left(x-3\right)\left(x^2+3x+9\right)+6x\left(x+2\right)\)
Cảm ơn các bạn ^^
Cho A = x2+xy+y2--3x-3y+3002. Tìm x,y để A min.
1 like cho bạn nào trả lời nhanh nhất.
Tìm x:
a. \(\left(3x+4\right)\left(3x-4\right)-\left(2x+5\right)^2=\left(x-5\right)^2+\left(2x+1\right)^2-\left(x^2-2x\right)+\left(x-1\right)^2\)
b. \(-5\left(x+3\right)^2+\left(x-1\right)\left(x+1\right)+\left(2x-3\right)^2=\left(5x-2\right)^2-5x\left(5x+3\right)\)
Tính :
a) \(\left(2+xy\right)^2\)
b) \(\left(5-3x\right)^2\)
c) \(\left(5-x^2\right)\left(5+x^2\right)\)
d) \(\left(5x-1\right)^3\)
e) \(\left(2x-y\right)\left(4x^2+2xy+y^2\right)\)
f) \(\left(x+3\right)\left(x^2-3x+9\right)\)
B1. tìm x :
a. (x+3)3 -x(3x+1)2 + (2x+1).(4x2-2x+1)-3x2=42
b. 5x(x+3)2-5(x+1)3+15(x+2)(x-2)=5
B2. tìm cặp x , y
x2(x+3)+y2(y+5)-(x+y)(x2-xy+y2)=0
Phân tích đa thức thành nhân tử:
1)5x^2-4x;
2)8x^2(x-3y)-12x(x-3y);
3)3(x-y)-5x(y-x)