Ответ:
3:
a) (x-y)•(x+y+1)
б) (2x-y-3)•(2x-y+3)
в) (2a-5)•(10a-9)
4:
6y²+2y-9y-3+2(y²-25)=2(1-4y+4y²)+6y
6y²+2y-9y-3+2•y²-50= 2-8y+8y²+6y
8y²-7y-53=2-2y+8y²
-7y-53=2-2y
-7y+2y=2+53
-5y=55
y= -11
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Answers & Comments
Ответ:
3:
a) (x-y)•(x+y+1)
б) (2x-y-3)•(2x-y+3)
в) (2a-5)•(10a-9)
4:
6y²+2y-9y-3+2(y²-25)=2(1-4y+4y²)+6y
6y²+2y-9y-3+2•y²-50= 2-8y+8y²+6y
8y²-7y-53=2-2y+8y²
-7y-53=2-2y
-7y+2y=2+53
-5y=55
y= -11