Các câu hỏi tương tự
Rút gọn biểu thức
a, (3+1)(3^2+1)(3^4+1)(3^8+1)(3^16+1)(3^32+1)
b, (a+b+c)^2+(a-b-c)^2+(b-c-a)^2+(c-a-b)^2
c,(a+b+c+d)^2 +( a+b-c-d)^2+(a+c-b-d)^2+( a+d-b-c)^2
Rút gọn các biểu thức:
a, (3x+1)^2-2(3x+1)(3x+5)+(3x+5)^2
b,(3+1)(3^2+1)(3^4+1)(3^8+1)(3^16+1)(3^32+1)
c,(a+b-c)^2+(a-b+c)^2-2(b-c)^2
d,(a+b+c)^2+(a-b-c)^2+(b-c-a)^2+(c-a-b)^2
e,(a+b+c+d)^2+(a+b-c-d)^2+(a+c-b-d)^2+(a+d-b-c)^2
1)Rút gọn biểu thức
a)(a+b-c)^2+(a-b+c)^2-2(b-c)^2
b)(a+b+c)^2+(a-b-c)^2+(b-c-a)^2+(c-a-b)^2
c)(a+b+c+d)^2+(a+b-c-d)^2+(a+c-b-d)^2+(a+d-c-b)^2
2)CMR:(a^2+b^2+c^2)(x^2+y^2+z^2)=(ax+by+cz) với x,y,z khác 0 thì x/a=b/y=c/z
3)Cho (a+b+c)^2=3(a^2+b^2+c^2).CMR a=b=c
4)Cho (a+b+c)^2=3(ab+bc+ca).CMR a=b=c
a, 2.x.(x-1)^2-3.x.(x+3).(x-3)-4.x.(x+1)^2
b,(a-b+c)^2-(b-c)^2+2.a.b-2.a.c
c,(3.x+1)^2-2.(1+3.x).(3.x+5)+(3.x+5)^2
d, (3+1).(3^2+1).(3^4+1).(3^8+1).(3^16+1).(3^32+1)
e, (a+b-c)^2+(a-b+c)^2+(b-c-a)^2+(c-a-b)^2
Tính nhanh:
a) 2x(2x-1)^2-3x(x+3)(x-3)-4x(x+1)^2
b)(3x+1)^2-2(3x+1)(3x+5)+(3x+5)^2
c)(a-b+c)^2+(b-c)^2+2ab-2ac
d)(3+1)(3^2+1)(3^4+1)(3^8+1)(3^16+1)(3^32+1)
e)(a+b-c)^2+(a-b+c)^2-2(b-c)^2
1. a/ (3+1)(3^2+1)(3^4+1)(3^8+1)(3^{16}+1)(3^{32}+1)b/(a+b+c)^2+(a-b-c)^2+(b-c-a)^2+(c-a-b)^2c/(a+b+c+d)^2+(a+b-c-d)^2+(a+c-b-d)^2+(a+d-b-c)^2
Đọc tiếp
1. a/ (3+1)(3\(^2\)+1)(3\(^4\)+1)(3\(^8\)+1)(3\(^{16}\)+1)(3\(^{32}\)+1)
b/(a+b+c)\(^2\)+(a-b-c)\(^2\)+(b-c-a)\(^2\)+(c-a-b)\(^2\)
c/(a+b+c+d)\(^2\)+(a+b-c-d)\(^2\)+(a+c-b-d)\(^2\)+(a+d-b-c)\(^2\)
Rut gon bieu thuc sau:
A=(3x+1)2-2(3x+1)(3x+5)+(3x+5)2
B=(3+1)(32+1)(34+1)(38+1)(316+1)(332+1)
C=(a+b-c)2+(a-b+c)2-2(b-c)2
D=(a+b+c)2+(a-b-c)2+(b-c-a)2+(c-b-a)2
E=(a+b+c)3-(b+c-a)3-(a-c+b)3-(a+b-c)3
15 tháng 10 2021 lúc 20:50
1. CMR: Nếu a,b,c là độ dài 3 cạnh tam giác thì:2a^2b^2+2b^2c^2+2c^2a^2-a^4-b^4-c^402. PTĐT thành nhân tử a) a^6+a^4+a^2b^2+b^4+b^6b) a^3+3ab+b^3-1c) a^2b^2left(b-aright)+b^2c^2left(c-bright)-c^2a^2left(c-aright)d) left(x^2+y^2right)^3+left(z^2-x^2right)^3-left(y^2+z^2right)^3
Đọc tiếp
1. CMR: Nếu a,b,c là độ dài 3 cạnh tam giác thì:
\(2a^2b^2+2b^2c^2+2c^2a^2-a^4-b^4-c^4>0\)
2. PTĐT thành nhân tử
a) \(a^6+a^4+a^2b^2+b^4+b^6\)
b) \(a^3+3ab+b^3-1\)
c) \(a^2b^2\left(b-a\right)+b^2c^2\left(c-b\right)-c^2a^2\left(c-a\right)\)
d) \(\left(x^2+y^2\right)^3+\left(z^2-x^2\right)^3-\left(y^2+z^2\right)^3\)
Rút gọn:
a) A=(4-5x)2-(3+5x)2
b) B=(3x-1)(1+3x)-(3x+1)2
c) C=(2x+5)3-(2x-5)3-(120x2+49)
d) D=(2a-b+2)3-6(2a-b+2)2+12(2a-b+2)-8-(2a-b)3