\(\left(3a+1\right)^2+2\left(3a+1\right)\left(3x+5\right)+\left(3x+5\right)^2\\ =\left(3a+1+3x+5\right)^2\\ =\left[3\left(a+x\right)+6\right]^2\\ =\left[3\left(a+x+2\right)\right]^2\\ =9\left(a+x+2\right)^2\)
\(\left(3a+1\right)^2+2\left(3a+1\right)\left(3x+5\right)+\left(3x+5\right)^2\\ =\left(3a+1+3x+5\right)^2\\ =\left[3\left(a+x\right)+6\right]^2\\ =\left[3\left(a+x+2\right)\right]^2\\ =9\left(a+x+2\right)^2\)
1) Rút gọn
a) (3x - 2)2 - (1+ 5x)2
b) (3x + 4)(3x - 4) - (5 - x)2
c) (\(\dfrac{1}{2}\)x + 4)2 - (\(\dfrac{1}{2}\)x + 3)(\(\dfrac{1}{2}\)x - 3)
1. Rút gọn các biểu thức sau:
M = (2a+b)2-(b-2a)2
N = (3a+2)2+2a(1-2b)+(2b-1)2
A = (m-n)2+4mn
2. Tính:
a) (x+5)2 b) (5/2-t)2
c) (2u+3v)2 d) (-1/8 a+2/3 bc)2
e) (x/y-1/z)2 f) (mn/4-x/6)(mn/4+x/6)
Rút gọn :
1. (2x-5)(3x+1)-(x-3)^2+(2x+5)^2-(3x+1)^3
2. (2x-1)(2x+1)-3x-2)(2x+3)-(x-1)^3+(2x+3)^3
3. (x-2)(x^2+2x+4)-(3x-2)^3+(3x-4)^2
4. (7x-1)(8x+2)-(2x-7)^2-(x-4)^3-(3x+1)^3
5. (5x-1)(5x+1)-(x+3)(x^2-3x+9)-(2x+4)^2-(3x-4)^2+(2x-5)^3
6. (4x-1)(x+2)-(2x+5)^2-(3x-7)^2+(2x+3)^3=(3x-1)^3
Bài 3. Rút gọn các đa thức sau
a/ (2x-3)(4x^2+6x+9)- (2x+1)(4x^2 - 2x +1)
b/ (x+ 2)(x^2- 2x+4) – (x^3- 2)
c/ (3x+ 5)(9x^2 - 15x +25)- 3x(3x-1)(3x+1)
d/ x^6 - (x^2 + x +1)(x^2 - 1)(x^2 - x+ 1)
Thu gọn: (3a-2).(2a^2-1)+(a+3).(5-6a^2)
Rút gọn và tính gt biểu thức
A= (3a-1)^2*(9a^2+3a+1)-(3a+1)*(9a^2-3a+1)+2a+2 vs a=5
B= (4x^2+2x+1)-2x*(10x^2-5x-2) vs x=15
C= 5x*(x-4y)-4y*(y-5x) vs x=-1/5, y=-1/2
mn ơi giúp mình vs ạ sáng mai mình cần rồi gấp lắm ạ
mình cảm ơn rất nhiều
làm tính nhân
a,(-a^4x^5)(a^6+x+20^3x^2-11ax^5)
b,(2/3a^2b^2-4/3ab^2)(-1/2a^3b)
help me???thanks
làm tính nhân
a,(-a^4x^5)(a^6+x+20^3x^2-11ax^5)
b,(2/3a^2b^2-4/3ab^2)(-1/2a^3b)
help me???thanks
1) rút gọn biểu thức
a) (x2- 5)-(x+7)(x-7)
b)(2x+3y)2+(3x-2y)2-2(2x+3y)(2x+3y93x-2y)