埴一填.
18+12=12+
36×42+36×58= ×( + )
2×9×5=2× ×9
(25+9)×4= × + ×
8×(5×9)=8× ×
93+84+16= +( + )
数学医院.
318﹣139﹣39
=318﹣(139﹣39)
=318﹣100
=218
354﹣(154+72)
=354﹣154+72
=200+72
=272
试题篮
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