5.66x7.28一3.16x3.16一3.16x4.12(用简便方法做)
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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)
=5.66×7.28-3.16×7.28
=(5.66+3.16)×7.28
=8.82×7.28
=64.2096
=5.66×7.28-3.16×(3.16+4.12)
=5.66×7.28-3.16×7.28
=(5.66+3.16)×7.28
=8.82×7.28
=64.2096
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