巧算28.45-7.5+2.55+2.5
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巧算28.45-7.5+2.55+2.5巧算28.45-7.5+2.55+2.5巧算28.45-7.5+2.55+2.528.45-7.5+2.55+2.5=28.45+2.55+2.5-7.5=31
巧算28.45-7.5+2.55+2.5
巧算28.45-7.5+2.55+2.5
巧算28.45-7.5+2.55+2.5
28.45-7.5+2.55+2.5
=28.45+2.55+2.5-7.5
=31-5
=26
28.45-7.5+2.55+2.5
=28.45+2.55+2.5-7.5
=31-5
=26
28.45-7.5+2.55+2.5 =28.45-(7.5+2.5)+2.55=28.45-10+2.5=28.45-(10+2.5)=28.45-12.5=15.95
28.45-7.5+2.55+2.5
=28.45+2.55-7.5+2.5
=31-5
=26
巧算28.45-7.5+2.55+2.5
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