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Lovata
@Lovata
December 2021
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20 баллов за 3 задания! (Математика) 7-8 класс
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DariosI
Verified answer
№1
-(с²+10с+25)-(с²-4с+3с-12)=-с²-10с-25-с²+с+12=-2с²-9с-13
№2
6b-13=-55
6b=-55+13
6b=-42
b=-7
№3
8x+4y-32=0
3x+4y-7=0
5x-32+7=0
2x+y-8=0
5x=25
2x+y-8=0
x=5
y=8-2*5
x=5
y=-2
x*y=-2*5=-10
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Answers & Comments
Verified answer
№1-(с²+10с+25)-(с²-4с+3с-12)=-с²-10с-25-с²+с+12=-2с²-9с-13
№2
6b-13=-55
6b=-55+13
6b=-42
b=-7
№3
8x+4y-32=0
3x+4y-7=0
5x-32+7=0
2x+y-8=0
5x=25
2x+y-8=0
x=5
y=8-2*5
x=5
y=-2
x*y=-2*5=-10