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=20+(6.72-7.9)×3.57-6.43×(7.9-6.72) =20-(7.9-6.72)×3.57-6.43×(7.9-6.72) =20-(7.9-6.72)×(3.57+6.43) =20-1.18×10=20-11.8=8.2
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