\(\left(3x-5\right)^2-\left(3x+5\right)^2=\left(3x-5-3x-5\right)\left(3x-5+3x+5\right)\)
\(=-10.6x=-60x\)
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Bài 3: Những hằng đẳng thức đáng nhớ
Các câu hỏi tương tự
Rút gọn biểu thức sau :
1, (3x+5)2+(3x-5)-(3x+2)(3x-2)
a, x(3x+1)-5 b, (x-5)² (3x-2) (3x+2)
thu gọn biểu thức sau:
(3x+1)2-2(3x+1)(3x+5)+(5x+5)2
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
25 tháng 7 2017 lúc 19:46
Rút gọn
(3x+1)^2-2(3x+1)(3x+5)+(5x+5)^2
\(1, (-x+5)(x-2)+(x-7)(x+7)=(3x+1)^2-(3x-2)(3x+2)\)
\(2, (5x-1)(x+1)-2(x-3)^2=(x+2)(3x-1)-(x+4)^2+(x^2-x)\)
3, \((x-7)(x+1)-(x-3)^2=(3x-5)(3x+5)-(3x+1)^2 +(x-2)^2-x^2\)
a/ (x+1) ² - (x-1) ² - 2(x+1)(x-1)
b/ 5(x+2)(x-) - 1/2 . (6-8x) ² + 17
c/ (3x+1) ² - 2(3x+1)(3x+5)+(3x+5) ²
Tìm x, biết
a/ 6x2 -(2x+3)(3x-2)=7
b/5x(12+7)-3x(80x-5)=-100
c/(3x-5)(7-5x)-(5x-2)(2-3x)=4
1 Tìm x
a,(2.x-5)2-(2.x-3)(2x+3)=5
b,(x+3)3-x(x+4)(x-4)=27
c,(3x-2)2-(3x+5)2=4
d, (3x+5)2-(x-3)2=0