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Câu 11. !"#$%&
'"()&*+,-.&/+0 !1%&%23#45
 !"+,-""617%8&%239
-1:;%<%&%2"&%25;=+1!%&<%%> 4?%@
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Giải:
Cách 1:#A@
GλH"BHB⇒)H"6HλGλ'I
:J@#A⇒K%5L#MN+?%OP@3LQ:R7#42&*%
),-⇒<%%&23=#MN+?%OP 4E:'IHE'F⇒&+S

Cách 2:
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G34L<%&%2@5& %&HOP10)U+,-++&,<V@&,W
#MN&%25<%%∆ 4Q:R7#4&&%*%),-&(N 4#MN
&%23L<%&%2%X;%⇒<%%&23=#MN+?%OP 4E:'IH
E'F⇒&+S1
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