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fernandasprizon81
@fernandasprizon81
October 2020
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como resolvo essa conta?? fazendo favor
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fagnerdi
A)
(a-b)²=45
a²-2ab+b²=45
a²+b²-2ab=45
a²+b²-2(10)=45
a²+b²=45+20
a²+b²=65
b)
(x-y)²=18
x²-2xy+y²=18
x²+y²-2xy=18
96 -2xy=18
-2xy=18-96
-2xy=-78 (-1)
2xy=78
xy=78/2
xy=39 (3)
3xy=117
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(a-b)²=45
a²-2ab+b²=45
a²+b²-2ab=45
a²+b²-2(10)=45
a²+b²=45+20
a²+b²=65
b)
(x-y)²=18
x²-2xy+y²=18
x²+y²-2xy=18
96 -2xy=18
-2xy=18-96
-2xy=-78 (-1)
2xy=78
xy=78/2
xy=39 (3)
3xy=117