横线上最大填几? ×5<36 ×7<44 ×4<37 ×8<26.
561﹣ 72=561﹣( 128□72 ) A﹣B﹣ =A﹣( □C ) 125× ﹣25×64=( □ )x 64 (A+B)× = ×C+ □C 102× = ×50+ ×50.
9000﹣9= ×9.
计算:1.25×+1×﹣125%×= .
计算:5.62×49﹣5.62×39+43.8= .
计算:197×198﹣196×199= .