25.48-(9.4×0.52)
=25.48-〔9.4×(0.5+0.02)〕
=25.48-〔9.4×0.5+9.4×0.02〕
=25.48-〔4.7+0.188〕
=25.48-4.888
=20.592
25.48-[9.4×(1-0.48)]
=25.48-(9.4-9.4×0.48)
=25.48-9.4+9.4×0.48
=16.08+9.4×0.48
=16.08+9.4×(0.5-0.02)
=16.08+9.4×0.5-9.4×0.02
=16.08+4.7-0.188
=20.78-0.188
=20.592