35*14-70+30怎样简便怎样算?
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![35*14-70+30怎样简便怎样算?](/uploads/image/z/441857-65-7.jpg?t=35%2A14-70%2B30%E6%80%8E%E6%A0%B7%E7%AE%80%E4%BE%BF%E6%80%8E%E6%A0%B7%E7%AE%97%3F)
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35*14-70+30怎样简便怎样算?
35*14-70+30怎样简便怎样算?
35*14-70+30怎样简便怎样算?
=70*7-40
=490-40
=450
=(7*5*7*2)—40
=(7*7)*(2*5)—40
=49*10—40
=490—40
=450
70(7-1)+30
=70*6+30
=420+30
=450