计算: (1)[4.2×5-(1÷0.25+9.1÷0.7)]÷0.004; (2)4.5×4.8÷0.25÷15÷0.24.
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(1)[4.2×5-(1÷0.25+9.1÷0.7)]÷0.004
=[4.2×5-(4+13)]÷0.004
=[4.2×5-17]÷0.004
=[21-17]÷0.004
=4÷0.004
=1000;
(2)4.5×4.8÷0.25÷15÷0.24
=4.5×4.8÷(0.25×15×0.24)
=21.6÷(0.25×15×4×0.06)
=21.6÷[(0.25×4)×(15×0.06)]
=21.6÷[1×0.9]
=21.6÷0.9
=24.
=[4.2×5-(4+13)]÷0.004
=[4.2×5-17]÷0.004
=[21-17]÷0.004
=4÷0.004
=1000;
(2)4.5×4.8÷0.25÷15÷0.24
=4.5×4.8÷(0.25×15×0.24)
=21.6÷(0.25×15×4×0.06)
=21.6÷[(0.25×4)×(15×0.06)]
=21.6÷[1×0.9]
=21.6÷0.9
=24.
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