Toán Lớp 8: a)2xy.3x2y ³
b)x(x ²-2x+5)
c)(3x ²-6x):3x
d)(x ²-2x+1):(x-1)
mik bt lm rồi nhg xem đúng ko
Leave a reply
Register Now
Login
Lost Password
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Toán Lớp 8: a)2xy.3x2y ³
b)x(x ²-2x+5)
c)(3x ²-6x):3x
d)(x ²-2x+1):(x-1)
mik bt lm rồi nhg xem đúng ko
Comments ( 2 )
Giải đáp + Lời giải và giải thích chi tiết:
a, 2xy . 3x.2y^3
=(2.3.2).(x.x).(y.y^3)
=12x^2y^4
b, x(x^2-2x+5)
=x^3-2x^2+5x
c, (3x^2-6x):3x
=(3x(x-2)):3x
=x-2
d, (x^2-2x+1):(x-1)
=(x-1)^2:(x-1)
=x-1
Áp dụng :
+) A^2-2AB+^2=(A-B)^2
$\text{a, 2xy.3x.2y³}$
$\text{= (2.3.2). (x.x).(y.y³)}$
$\text{= 12x²$y^{4}$ }$
\text{b, x(x²-2x+5)}
\text{= x³-2x²+5x}
\text{c, (3x²-6x):3x}
\text{= (3x²:3x)+ (-6x:3x)}
\text{= x-2}
\text{d, (x²-2x+1):(x-1)}
\text{= (x-1)²:(x-1)}
\text{= x-1}