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Bigo
@Bigo
July 2022
1
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Решите пожалуйста!
1. Преобразуйте в многочлен:
а) (а-4)(а+4)-2а(3-а)
б) (p+3)(p-11)+(p+6)²
2.Найдите значение выражения:
(4х-у)²-(4х+у)² при х= 1 1/8, у=-0,2.
3. Упростите выражение:
2(x-5)²-2(7x-1)²
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Answers & Comments
Lesben
1)(a-4)(a+4)-2a(3-a)=(a²-16)-(6a-2a²)=a²-16-6a+2a²=3a²-6a-16
(p+3)(p-11)+(p+6)²=p²+3p-11p-33+p²+12p+36=2p²+4p+3
2)(4x-y)²-(4x+y)²=(4x-y+4x+y)(4x-y-4x-y)=8x.(-2y)=-16xy
-16.9/8.(-0,2)=-18.(-0,2)=3,6
3)2(x-5)²-2(7x-1)²=2(x²-10x+25)-2(49x²-14x+1)=
=2x²-20x+50-98x²+28x-2=-96x²+8x+48=-8(12x²-x-6)
2 votes
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Answers & Comments
(p+3)(p-11)+(p+6)²=p²+3p-11p-33+p²+12p+36=2p²+4p+3
2)(4x-y)²-(4x+y)²=(4x-y+4x+y)(4x-y-4x-y)=8x.(-2y)=-16xy
-16.9/8.(-0,2)=-18.(-0,2)=3,6
3)2(x-5)²-2(7x-1)²=2(x²-10x+25)-2(49x²-14x+1)=
=2x²-20x+50-98x²+28x-2=-96x²+8x+48=-8(12x²-x-6)