giúp mình với rút gọn (3y-5x)^2-(5x+3y)(10x-6y)+(5x+3y)^2 22/11/2021 Bởi Jasmine giúp mình với rút gọn (3y-5x)^2-(5x+3y)(10x-6y)+(5x+3y)^2
$(3y-5x)^2-(5x+3y)(10x-6y)+(5x+3y)^2$ $=(5x-3y)^2-2(5x+3y)(5x-3y)+(5x+3y)^2$ $=[(5x-3y)-(5x+3y)]^2$ (HĐT thứ 2) $=(5x-3y-5x-3y)^2$ $=(-6y)^2$ $=36y^2$. Bình luận
(3y-5x)²-(5x+3y)(10x-6y)+(5x+3y)² =(5x-3y)²-2(5x+3y)(5x-3y)+(5x+3y)² =[(5x-3y)-(5x+3y)]²=(-6y)²=36y² Bình luận
$(3y-5x)^2-(5x+3y)(10x-6y)+(5x+3y)^2$
$=(5x-3y)^2-2(5x+3y)(5x-3y)+(5x+3y)^2$
$=[(5x-3y)-(5x+3y)]^2$ (HĐT thứ 2)
$=(5x-3y-5x-3y)^2$
$=(-6y)^2$
$=36y^2$.
(3y-5x)²-(5x+3y)(10x-6y)+(5x+3y)²
=(5x-3y)²-2(5x+3y)(5x-3y)+(5x+3y)²
=[(5x-3y)-(5x+3y)]²=(-6y)²=36y²