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小学数学思维题：A+B+C=107，A-B=12，B-C=13，A、B、C各是几呢
精讲小学数学思维题：等量代换 A+B+C=107，A-B=12，B-C=13 A=（ ）B=（ ）C=（ ）
小学数学思维题64/235
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