(1)(2)小题,

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(1)(2)小题,
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(1)(2)小题,
(1)(2)小题,
 

(1)(2)小题,
1
(1)
66÷(11/12)=66x(12/11)=6x12=72(千克)
(2)
72x(1-1/2)=72x(1/2)=36(千克)