用简便方法计算。228-(28十43)、415一198\426十122一126十78\630÷3_百度知道972➗（720-21X33）怎样简便运算_百度知道The page is temporarily unavailable
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/etc/nginx/nginx.conf.(十61/4)十(十1/2)十(一6.25)十(十1/3)十(一7/9)十(一5/6)简便计算_百度知道简便运算（脱竖计算,一步一步算 ）630/21 490/14是脱式
冰骚镣萍125
第一道：630÷21 ＝630÷7÷3 ＝90÷3 ＝30 第二道：490÷14 ＝490÷7÷2 ＝70÷2 ＝35
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