690-(48+90)简便计算
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690-(48+90)简便计算
690-(48+90)简便计算
690-(48+90)简便计算
690-(48+90)
=690-48-90
=(690-90)-48
=600-48
=552
690-90-48
=600-48
=552
690-(48+90)简便计算
690-(48+90)简便计算
690-(48+90)简便计算
690-(48+90)
=690-48-90
=(690-90)-48
=600-48
=552
690-90-48
=600-48
=552