(x-2)(x+2)-(x+1)^2+(x+1)(x+2)
=X2-22-(x2+2x+1)+x2+2x+x+2
=x2-4-x2-2x-1+x2+2x+x+2
=x2-3+x
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Bài 3: Những hằng đẳng thức đáng nhớ
Các câu hỏi tương tự
Tìm x biết
a,(x+4)^2-(x+1)(x-1)=16
b,(2x-1)^2-(x+3)-5(x-7)(x+7)=0
c,3(x-1)^2-3x(x-5)=1
d,6(x-2)^2+(5x-2)^2-4(3x-1)(5x-2)=0
e,(x-2)^3-x^2(x-6)=4
g,(x-1)(x^2+x+1)-x(x+2)(x-2)=5
h,(x-1)^3-(x+3)(x^2-3x+9)+3(x^2-4)=2
Mn giúp mình bài này với:
B1:A=(x^2+3x+1)^2+(3x-1)^2+(3x-1)^2-2(x^2+3x+x+1)(3x-1)
B2:TÌm x:
a,2(x-1)^2+(x+3)^2=3(x-2)(x+1)
b,(x+2)^2-2(x-3)^2=(x+1)^2
c,(x-1)^2+(x-2)^2=2(x+4)^2-22x+7
tìm x biết:
a) (x-3)2-4=0
b) x2-2x=24
c) (x+4)2-(x+1)(x-1)=16
d) (2x+1)2-4(x-1)2=9
e) (x+3)2-(x-4)(x+8)=1
f) (2x-1)2+(x+3)2-5(x+7)(x-7)=0
g) 3(x+2)2+(2x-1)2-7(x+3)(x-3)=36
2 tháng 10 2020 lúc 18:48
a)(2x-1)^2+(x+3)^2-5(x+7)(x-7)=0
b)(x+2)(x^2-2x+4)-x(x^2+2)=15
c)(x+3)^3-x(3x+1)^2+(2x-1)(4x^2-2x+1)=28
d)(x^2-1)^3-(x^4+x^2+1)(x^2-1)=0
Bài 1: rút gọn
a, (2x-1)^2 +4(x-1) (x+3)-2(5-3x)^2
b, (2a^2+2a+1)(2a^2-2a+1)-(2a^2+1)^2
c, (9x-1)^2+(1-5x)^2+2(9x-1)(1-5x)
d, (x^2+5x-1)^2+2(5x-1)(x^2-5x+1)+(5x-1)^2
e, x(x-1)(x+1)-(x+1)(x^2-x+1)
f, x(x+4)(x-4)-(x^2+1)(x^2-1)
\(1, (-x+5)(x-2)+(x-7)(x+7)=(3x+1)^2-(3x-2)(3x+2)\)
\(2, (5x-1)(x+1)-2(x-3)^2=(x+2)(3x-1)-(x+4)^2+(x^2-x)\)
3, \((x-7)(x+1)-(x-3)^2=(3x-5)(3x+5)-(3x+1)^2 +(x-2)^2-x^2\)
Rút gọn
1 (x-2)^2 + (x+3)^2-2.(x+1).(x-1)
2 ( x-y).(x+y).(x^2 +y^2).(x^4 + y^4)
3 3.(x-y)^2-2(x+y)^2+(x+y).(x-y)
4 (x-1)^2 -2(x-1)(x-3)+(x-3)^2
1; Thực hiện phép tính.
1, (x+1).(x-2).(x-3)^2
2, x.(x+1)-(x+2).(x-3)
3, (x+2)^2 -(x-2)^2
4, (x+1)^3-(x-1)^3
5,( x+y)^3 -(x-y)^3
6, (x-3).(x+3)-(x-1)^2
7, (x+1).(x-1).(x^2+1).(x^4+1)-x^8
các bạn giúp mình với
Tìm x biết:
a) (x-1)(x^2+x+1) - x(x+2)(x-2) = 5
b) (6x-2)^2 + (5x-2)^2 - 4(3x-1)(5x-2) = 0
c) (x+1)^3 - x(x-2)^2 + x - 1 = 0
Tìm x, biết:
a) 6(x + 2)(x - 3) - 3(x - 2)2 - 3(x - 1)(x + 1) = 1
b) (x - 1)(x2 + x + 1) + x(x + 2)(2 - x) = 5
c) (x - 1)3 - (x + 3)(x3 - 3x + 9) + 3(x - 2)(2 + x) = 2