Thu gọn biểu thức
A=2x^2-5x-2x(x+1)
B=(x+2y)(x-2y)-4y(x-y)
C=(2x-8)(x^2+4x+16)-2x(x^2-2)
Thu gọn biểu thức A=2x^2-5x-2x(x+1) B=(x+2y)(x-2y)-4y(x-y) C=(2x-8)(x^2+4x+16)-2x(x^2-2)
By Jade
By Jade
Thu gọn biểu thức
A=2x^2-5x-2x(x+1)
B=(x+2y)(x-2y)-4y(x-y)
C=(2x-8)(x^2+4x+16)-2x(x^2-2)
A= 2x² – 5x – 2x( x + 1 )
A= 2x² – 5x – 2x² – 2x
A= -5x – 2x
A= -7x
B=( x + 2y )( x – 2y ) – 4y( x – y )
B= x² – (2y)² – 4xy + 4y²
B= x² – 4y² – 4xy + 4y²
B= x² – 4xy
C= ( 2x – 8 )( x²+ 4x + 16 ) – 2x( x² – 2 )
C= 2x³ + 8x² + 32x – 8x² – 32x – 128 – 2x³ + 4x
C= -128 + 4x
CHÚC BẠN HC TỐT, CHO MIK XIN CTHN
Đáp án:
Giải thích các bước giải:
A = 2x^2 – 5x – 2x(x + 1)
A = 2x^2 – 5x – 2x^2 – 2x
A = -7x
B = (x + 2y)(x – 2y) – 4y(x – y)
B = x^2 – (2y)^2 – 4xy + 4y^2
B = x^2 – 4y^2 – 4xy + 4y^2
B = x^2 – 4xy
C = (2x – 8)(x^2 + 4x + 16) – 2x(x^2 – 2)
C = 2(x – 4)(x^2 + 4x + 16) – 2x^3 + 4x
C = 2(x^3 – 4^3) – 2x^3 + 4x
C = 2(x^3 – 64) – 2x^3 + 4x
C = 2x^3 – 128 – 2x^3 + 4x
C = -128 + 4x