(2·5-2·5x0·6)除以4

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(2·5-2·5x0·6)除以4

(2·5-2·5x0·6)除以4
(2·5-2·5x0·6)除以4

(2·5-2·5x0·6)除以4
(2·5-2·5x0·6)除以4
=[2.5×(1 - 0.6)]÷4
=2.5×0.4÷4
=2.5×0.1
=0.25