Toán Lớp 8: a) Lm tính nhân (2x+3).5x
b) Tính nhanh: $1011^{2}$ -$1011^{2}$
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) Lm tính nhân (2x+3).5x
b) Tính nhanh: $1011^{2}$ -$1011^{2}$
Comments ( 2 )
a, (2x + 3). 5x = 2x. 5x + 3. 5x = 10x^2 + 15x
b, 1011^2 – 1011^2 = (1011 – 1011). (1011 + 1011) = 0
c, x^2 + 2xy – x – 2y
= (x^2 – x) + (2xy – 2y)
= x(x – 1) + 2y(x – 1)
= (x + 2y)(x – 1)
$a)(2x+3).5x$
$=2x.5x+3.5x$
$=10x^2+15x$
$b)1011^2-1011^2$
$=0$ (đây là hai số giống nhau)
$#mie1208$