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76.1×776.1×7
=76.1x(700+76.1)x7
=(53270+76.1²)x7
=[53270+(80-3.9)²]x7
=(53270+6400-624+15.21)x7
=59061.21x7
=413428.47
=76.1x(700+76.1)x7
=(53270+76.1²)x7
=[53270+(80-3.9)²]x7
=(53270+6400-624+15.21)x7
=59061.21x7
=413428.47
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