Question

RÚT GỌN CÁC BIỂU THỨC SAU 1 CÁCH NHANH NHẤT

A= (6x-2)^2 + (2-5x)^2+2(6x-2)(2-5x)

B= (2a^2+2a+1)(2a^2-2a+1)-(2a^2+1)^2

C=(x+3)(x^2-3x+9)-(54+x^3)

D=(2x+y)(4x^2-2xy+y^2)-(2x-y)(4x^2+2xy+y^2)

E=(a+b)^2-(a-b)^2

Answer 1

A= (6x-2)^2 + (2-5x)^2+2(6x-2)(2-5x)

= (6x-2)^2 +2(6x-2)(2-5x)+ (2-5x)^2

\(=\left(6x-2+2-5x\right)^2=x^2\)

B= (2a^2+2a+1)(2a^2-2a+1)-(2a^2+1)^2

\(=\left(2a^2+1\right)^2-4a^2-\left(2a^2+1\right)^2=4a^2\)

C=(x+3)(x^2-3x+9)-(54+x^3)

\(=\left(x^3+27\right)-54-x^3=27\)

D=(2x+y)(4x^2-2xy+y^2)-(2x-y)(4x^2+2xy+y^2)

\(=\left(2x+y\right)^3-\left(2x-y\right)^3\)

E=(a+b)^2-(a-b)^2

\(=\left(a+b+a-b\right)\left(a+b-a+b\right)=2a.2b=4ab\)

Answer 2

Secret Personv: thật.CTV lạ z

\(C=\left(x+3\right)\left(x^2-3x+9\right)-\left(54+x^3\right)\)

\(=x^3-27-54-x^3=-81\)

Answer 3

\(C=\left(x+3\right)\left(x^2-3x+9\right)-\left(54+x^3\right)\)

\(=x^3+27-54-x^3=-27\)