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幼苗
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(1)4789-5768÷56×27,
=4789-103×27,
=4789-2781,
=2008;
(2)(5.1÷0.17+4.2)×4.5,
=(30+4.2)×4.5,
=34.2×4.5,
=153.9;
(3)(0.75-[3/16])×([2/9]+[1/3]),
=[9/16]×[5/9],
=[5/16];
(4)[1/3]÷[([2/3]+[1/5])×[3/13]],
=[1/3]÷[[13/15]×[3/13]],
=[1/3]÷[1/5],
=[5/3].
1年前
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