( x-5)(x+5)-(x+3)2+3(x-2)2=(x+1)2- (x+4)(x-4)+3x2
<=>(x2-25)-(x+3)2+3(x-2)2=(x+1)2+(16-x2)+3x2
<=>x2-25-x2-6x-9+3x2-12x+12=x2+2x+1+16-x2+3x2
<=>3x2-18x-22=3x2+2x+17
<=>-20x=39
=>x=-39/20
Bai1:tìm x biết.
a)4×(x-5)-(x-1)×(4x-3)=5
b) (3x-4)×(x-2)=3x×(x-9)-3
c)(x-5)×(x-4)-(x+1)×(x-2)=7
d)(2x-1)×(x-2)-(x+3)×(2x-7)=3
Tìm x :
a) x(x - 4 ) - ( x^2 - 8 ) = 0
b) ( 3x + 2 )( x - 1 ) - 3( x + 1 )( x - 2 ) = 4
c) x( x + 5 )( x - 5 ) - ( x + 2 )( x^2 - 2x + 4 ) = 17
tìm x;y: 1) 9x^2-6x=9
2) (2x+3)^2 + 2(2x+3)(x-2)+(2-x)^2=4
3)(x+3)(3-x)=5
4)(3x+2)(9x^2-3x+1)=2
Tìm x biết
a, 3(x-1)^2 -3x(x-5)=1
b, (6x-2)^2 +(5x-2)^2-4(3x-1)(5x-2)=0
c, (x-2)^3-x^2(x-6)^=-5
bai1.tim x biet:
a,(x+2).(x+3)-(x-2).(x+5)=0
b,(2x+3).(x-4)+(x-5).(x-2)=(3x-5).(x-4)
c,(8x-3).(3x+2)-(4x+7).(x+4)=(2x+1).(5x-1)=33
1,Tìm x
a,3x+2(5-x)=0
b,x(2x-1(x+5)-(2x2+1)(x+4,5)=3,5
c,3x2-3x(x-2)=36
d,(3x2-x+1)(x-1)+x2(4-3x)=5/2
2,Thực hiện phép tính
a,(2x-1)(x2+5-4)
b,-(5x-4)(2x+3)
c,(2x-y)(4x2-2xy+y2)
d,(3x-4)(x+4)+(5-x)(2x2+3x-1)
e,7x(x-4)-(7x+3)(2x2-x+4)
Mai mình phải nộp rồi,giúp mình làm được câu nào thì viết lên luôn,ko cần làm hết đâu
dùng hằng đẳng thức để làm nha. cần gấp, thanks nhìu
a) (x-1)^3+(2-x)(4+2x+x^2)+3x(x+2)=17
b) (x+2)(x^2-2x+4)-x(x^2-2)=15
c) (x-3)^3-(x-3)(x^2+3x+9)+9(x+1)^2=15
d) x(x-5)(x+5)-(x+2)(x^2-2x+4)=3
Tìm x, biết:
a) 5(3x+5)-4(2x-3) = 5x+8(2x+12)+1
b) (2x+3)(x-4)-(3x-5)(x-4) = (5-x).(x-2)