561﹣ 72=561﹣( 128□72 )
A﹣B﹣ =A﹣( □C )
125× ﹣25×64=( □ )x 64
(A+B)× = ×C+ □C
102× = ×50+ ×50.
561﹣ 72=561﹣( 128□72 )
A﹣B﹣ =A﹣( □C )
125× ﹣25×64=( □ )x 64
(A+B)× = ×C+ □C
102× = ×50+ ×50.
试题篮
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