简便79330÷

脱式计算。240除[(92一7)除5]。26x4一125除5。330除[124一(85十17...
=240/17 26x4一125÷5 =（25+1）×4-25 =100+4-25 =79 330÷ [ 124一(85十17)]=330÷ [ 124-102 ]=330÷22 =330÷11÷2 =30÷2 =15