5.16乘七点二八减三点一六乘三点一六减三点一六乘四点一二的简算
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5.16X7.28-3.16X3.16-3.16X4.12
=5.16X7.28-3.16X(3.16+4.12)
=5.16X7.28-3.16X7.28
=7.28X(5.16-3.16)
=7.28X2
=14.56
=5.16X7.28-3.16X(3.16+4.12)
=5.16X7.28-3.16X7.28
=7.28X(5.16-3.16)
=7.28X2
=14.56
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