Ответ:
1. a
-7xy^2*3x^2y^3= -21y^5x^3
2. в
c^2-4p^2= (c-2p)(c+2p)
3. в
2x-y=5
x-y=2
y=-2+x
2x-(-2+x)=5
x=3
y=-2+3
y=1
(3;1)
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Answers & Comments
Ответ:
1. a
-7xy^2*3x^2y^3= -21y^5x^3
2. в
c^2-4p^2= (c-2p)(c+2p)
3. в
2x-y=5
x-y=2
2x-y=5
y=-2+x
2x-(-2+x)=5
x=3
y=-2+3
y=1
(3;1)