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My brother bought a book less, 2.4 yuan bought 3.06 yuan less, and my brother bought 0.58 yuan more. How much is this book? How to explain to children by mathematical methods
My brother bought less, and my brother in 2.4 yuan bought 3.06 yuan less.

Then brother and brother buy one, that is, buy two together, which will be less: 2.4+3.06=5.46 yuan.

If brothers buy 0.58 yuan more, they only buy one, which is less than buying two: 5.46+0.58=6.04.

Actually, I bought one less, so the price of one is 6.04 yuan.

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