Đáp án:
a = chu vi : 2 - b
b = chu vi : 2 - a
Giải thích các bước giải:
Chu vi = (a + b) x 2
⇒ a = chu vi : 2 - b
⇒ b = chu vi : 2 - a
Chu vi = (CD + CR) x 2
⇒ CR = chu vi : 2 - CD
⇒ CD = chu vi : 2 - CR
Giúp e với mấy anh ơi e cần gấp lém
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