Tính bằng hai cách
\(A)\) \((5,28+4,72)\) x \(4,5\)
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\((5,28+4,72)\) x \(4,5\)
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\(B)\) \((7,8-2,3)\) x \(6,4\)
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\((7,8-2,3)\) x \(6,4\)
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