\(7\left(4x-3\right)-2x\left(3-4x\right)\)
\(=7\left(4x-3\right)-2x\left(-4x+3\right)\)
\(=7\left(4x-3\right)-2x\left[-\left(4x-3\right)\right]\)
\(=7\left(4x-3\right)+2x\left(4x-3\right)\)
\(=\left(4x-3\right)\left(2x+7\right)\)
\(7\left(4x-3\right)-2x\left(3-4x\right)\)
\(=7\left(4x-3\right)-2x\left(-4x+3\right)\)
\(=7\left(4x-3\right)-2x\left[-\left(4x-3\right)\right]\)
\(=7\left(4x-3\right)+2x\left(4x-3\right)\)
\(=\left(4x-3\right)\left(2x+7\right)\)
Thu gọn biểu thức:
a)2x(x+7)-(x+3)(x-3)-(2x-5)^2
b)(x-2)(x+2)-4x(x-3)+(2x-7)^2
c)(4x-1)^3-(4x-3)(16x+3)
d)(2x-1)^3-(4x+1)^3
(2x+5)(2x-7)-(-4x-3)(-4x-3)=16
(2x-1). (8x+7)-4x. (4x-1)-5. (2x+3)
Tìm x:
a) (x-1) - (x+1) - (x-2) = 5
b) (2x-1) mũ 2 - (2x+3) mũ 2 = 7
c) (4x-3).(4x+3) - (4x-1) mũ 2 = 8
d) (2x+1).(2x-1) - (2x+3) = 9
\(Tìm\)\(A\)TRONG mỗi phân thức PHÂN THỨC SAU
\(\frac{4x^2-3x-7}{A}=\frac{4x-7}{2x+3}.\)
giải. Ta có : \(\left(4x^2-3x-7\right)\left(2x+3\right)=A.\left(4x-7\right)\)
\(Hay\)\(\left(4x^2-7x+4x-7\right)\left(2x+3\right)=A.\left(4x-7\right).\)
\(Hay\)\(\left(4x-7\right)\left(x+1\right)\left(2x+3\right)=A.\left(4x-7\right).\)
\(Vậy\)\(A=\left(x+1\right)\left(2x+3\right)=2x^2+5x+3.\)
Cô ơi, ở dòng hay thứ 2, chỗ : \(\left(x+1\right)\left(2x+3\right)\)từ đâu có vậy cô ? (cp6 làm, phân tích chi tiết giúp em nhe cô). Em cám ơn cô. :)
-8x.(2x+y)+(7+4x).(4x-3)
Tìm x biết
1,(2x+5)(2x-7)-(-4x-3)^2=16
2,(8x-3)(3x+2)-(4x+7)(x+4)=(2x+1)-(5x-1)
tìm x
1,(2x+3)^2+(2x+1)(2x-1)=22
2,(4x+3)(4x-3)=46+(4x-5)^2
3,(2x-1)^3-4x^2(2x-3)=5
4,(x+4)^2-(x-1)(x+1)=16
5,(2x-1)^2+(x+3)^2=5(x+7)(x-7)+325
6,(x^2+1)^2-(x^4+x^2+1)(x^2-1)=0
x mũ 3 - 4x mũ 2 - 8x + 8
3 x mũ 2 +13x -10
x(2x - 7) - 7 - 4x + 14 = 0
2x mũ 3 + 3x mũ 2 + 2x + 2 =0