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908×501-[731×1389-(547×236+842×731-495×361)]=

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原式=908×501-731×1389+(547×236+842×731-495×361)=908×501-731×1389+547×236+842×731-495×361=908×501-731×(1389-842)+547×236-495×361=908×501-731×547+547×236-495×361=908×501-(731-236...