Các câu hỏi tương tự
thu gọn
a)(2x-7)^2+(2x+7)^2-2(2x+7)(2x-7)
b)(5x-3)^2-(5x+3)^2-15(2x-1)
2x+3/2x+1-2x+5/2x+7=1-6x^2+9x-9/(2x+1)(2x+7)
Rút gọn các biểu thức
a( 3x-5) ( 2x+11)-(2x+3) (3x+7)
b (x-5) (2x+3)-2x(x-3)+x+7
Bài 1: Rút gọn
A=(7-2x)(7+2x)+(2x+7)2
B=(4x-5)2-(2x-1)(8x-5)
C=(5x-3)2-2(5x-3)(5-5x)+(5x-5)2
D=(2a+3b-c)(2a-3b+c)-(4a2-9b2-c2)
Bài 1: Rút gọn
A=(7-2x)(7+2x)+(2x+7)2
B=(4x-5)2-(2x-1)(8x-5)
C=(5x-3)2-2(5x-3)(5-5x)+(5x-5)2
D=(2a+3b-c)(2a-3b+c)-(4a2-9b2-c2)
d) (3x – 5)(7 – 5x) – (5x + 2)(2 – 3x) = 4 g) 3(2x - 1)(3x - 1) - (2x - 3)(9x - 1) =0 j) (2x – 1)(3x + 1) – (4 – 3x)(3 – 2x) = 3 k) (2x + 1)(x + 3) – (x – 5)(7 + 2x) = 8 m) 2(3x – 1)(2x + 5) – 6(2x – 1)(x + 2) = - 6
Tìm x biết : (2x-7)3=8(7-2x)2
Giải phương trình sau :
a,\(\dfrac{7-3x}{12}+\dfrac{5x+2}{7}=x+13\)
b,\(\dfrac{3\left(x+3\right)}{4}-\dfrac{1}{2}=\dfrac{5x+9}{7}-\dfrac{7x-9}{4}\)
c,\(\dfrac{2x+1}{3}-\dfrac{5x+2}{7}=x+3\)
d,\(\dfrac{2x-3}{3}-\dfrac{2x+3}{7}=\dfrac{4x+3}{5}-17\)
\(\dfrac{x+5}{x\left(2x-5\right)+2}+\dfrac{x+2}{x\left(2x-7\right)+3}=\dfrac{2x+7}{2x^2-7x+3}\)