a, (3x+2)2 - (3x-2)2 =5x+38 b, 3(x-2)2 +9(x-1) =3(x2+x-3)
c, (x+3)3 -(x-3)2 -(x-3)2 =6x+18 d, (x-1)3-x(x+1)2=5x(2-x)-11(x+2)
e, (x+1)(x2-x+1)-2x=x(x-1)(x+1) f, (x-2)3+(3x-1)(3x+1)=(x+1)3
Vận dụng hằng đẳng thức 4;5;6;7
Bài 3 tìm x biết
a)
(2x^2+1)^2-(2x-1)^2=72
b) (x+3)^2+(x-3)^2-2x(x-5)=38
c) (x-2).(x^2+2x+4)-x(x-3)(x+3)=10
help gấp
Tìm x
a 5(2x-3)-4(5x-7)=19-2(x+11)
b 7(4x+3)-4(x-1)=15(x+0,75)+7
c 3x-2,42+0,8x=3,38-0,2x
d (x-1)2+(x+3)2=2(x-2)(x+1)+38
e 5(x2-2x-1)+2(3x-2)=5(x+1)2
Tìm x
a 5(2x-3)-4(5x-7)=19-2(x+11)
b 7(4x+3)-4(x-1)=15(x+0,75)+7
c 3x-2,42+0,8x=3,38-0,2x
d (x-1)2+(x+3)2=2(x-2)(x+1)+38
e 5(x2-2x-1)+2(3x-2)=5(x+1)2
Tìm x
a 5(2x-3)-4(5x-7)=19-2(x+11)
b 7(4x+3)-4(x-1)=15(x+0,75)+7
c 3x-2,42+0,8x=3,38-0,2x
d (x-1)2+(x+3)2=2(x-2)(x+1)+38
e 5(x2-2x-1)+2(3x-2)=5(x+1)2
Tìm x
a 5(2x-3)-4(5x-7)=19-2(x+11)
b 7(4x+3)-4(x-1)=15(x+0,75)+7
c 3x-2,42+0,8x=3,38-0,2x
d (x-1)2+(x+3)2=2(x-2)(x+1)+38
e 5(x2-2x-1)+2(3x-2)=5(x+1)2
Giải phương trình:
1) (3x-1)^2-5(2x+1)^2+96x-3)(2x+1)=(x-1)^2
2) (x+2)^3-(x-2)^3=12(x-1)-8
3) x-1/4-5-2x/9=3x-2/3
4) 25x-655/95-5(x-12)/209=[89-3x-2(x-13)/5]/11
5) 29-x/21+27-x/23+25-x/25+23-x/27=-4
6) x-69/30+x-67/32=x-63/36+x-61/38
7)x+117/19+x+4/28+x+3/57=0
8) 59-x/41+57-x/43+2=x-55?45+x-53/47-2
9) Cho phương trình: mx+x-m^2=2x-2 (x là ẩn). Tìm m để phương trình:
a) Có nghiệm duy nhất
b) Vô số nghiệm
c) Vô nghiệm