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5.66*7.28-3.16*3.16-3.16*4.12 =5.66*7.28-3.16(3.16+4.12) =5.66x7.28-7.28x3.16 =7.28x(5.66-3.16) =7.28x2.5 =1.82x4x2.5 =18.2
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