(5x-1)+2(1-5x)(4+5x)+(5x+4)2.
Rút gọn b/t trên
Bài 5: Rút gọn các biểu thức:
P = (5x − 1) + 2(1 − 5x)(4 + 5x) + (5x+4)2
\(P=\left(5x-1\right)+2\left(1-5x\right)\left(4+5x\right)+\left(5x+4\right)^2\)
\(P=5x-1+\left(2-10x\right)\left(4+5x\right)+\left(5x+4\right)^2\)
\(P=5x-1+8+10x-40x-50x^2+25x^2+40x+16\)
\(P=\left(25x^2-50x^2\right)+\left(5x+10x-40x+40x\right)+\left(-1+8+16\right)\)
\(P=-25x^2+15x+23\)
rút gọn biểu thức
a. (5x+1)^2+2(5x-1)(5x+1)+(5x+1)^2
b.(x^2+8)(x+4)-(x+4)(x^2-4x+16)
Rút gọn biểu thức sau: P=(5x-1)+2(1-5x)(4+5x)+(5x+4)2
DỀ sai ròi kìa
P = ( 5x- 1) ^2 + 2 ( 1 - 5x) .(4+5x) + (5x+4)^2
= (5x- 1 )^2 - 2 ( 5x- 1).(5x+4) + (5x+4)^2
= (5x - 1 - 5x - 4) ^2 = ( - 5)^2 = 25
(**** )
P = (5x - 1) + [(-2).(-1).(1-5x).(4+5x)] + (5x+4)^2
= (5x - 1).[(-1)-2.(-1).(4+5x)] + (25x^2+40x+16)
= [(5x - 1).(10x + 7)] + (25x^2+40x+16)
= 50x^2 +35x - 10x - 7 + 25x^2+40x+16
= 75x^2 + 65x -9
Rút gọn biểu thức sau: P=(5x-1)+2(1-5x)(4+5x)+(5x+4)2
Rút gọn biểu thức :
A = 12.( 5^2 + 1 ).( 5^4 +1 ).( 5^8 + 1 ).( 5^16 + 1 )
B = ( 5x - 1 )2 + 2.( 1- 5x ).( 4 + 5x ) + ( 5x + 4 )^2
Rút gọn các biểu thức: P = (5x − 1) + 2(1 − 5x)(4 + 5x) + 5 x + 4 2
P = (5x − 1) + 2(1 − 5x)(4 + 5x) + 5 x + 4 2
= 5x – 1 + (2 – 10x).( 4+ 5x) + 5 x + 4 2
= 5x – 1 + 8 + 10x – 40x – 50 x 2 + 25 x 2 + 40x + 16
= (- 50 x 2 + 25 x 2 )+ ( 5x + 10x – 40x + 40x) + (- 1+ 8 + 16)
= -25 x 2 + 15x + 23
Rút gọn M=( 5x-1)+2(1-5x)(4x+5x)+(5x+4)2
Rút gọn biểu thức:
P = (5x - 1) + 2(1 - 5x)(4 + 5x) + (5x + 4)2
P = (5x - 1) + [(-2).(-1).(1-5x).(4+5x)] + (5x+4)^2
= (5x - 1).[(-1)-2.(-1).(4+5x)] + (25x^2+40x+16)
= [(5x - 1).(10x + 7)] + (25x^2+40x+16)
= 50x^2 +35x - 10x - 7 + 25x^2+40x+16
= 75x^2 + 65x -9
rút gọn biểu thức
a)P=(5x-1)+2(1-5x)(4+5x)+(5x+4)^2
b)Q=(x-y)^3+(y+x)^3+(y-x)^3-3xy(x+y)