Question

若x∧2-y∧2=24,x+y=6,x+2y=?

Answer 1

x-y

=(x-y)(x+y)/(x+y)

=(x²-y²)/(x+y)

=24/6

=4

与x+y=6 联立

2x=10

x=5

y=6-x=6-5=1

x+2y=5+2x1=7

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