小学简便运算
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共5个回答
热心网友
720/[(61-49)*5]
=720/{[（61+1）-（49+1)]*5}
=720/[(62-50)*5]
=(72*10)/(12*5)
=(72*10)/60
=72/6
=12
45*[(293-68)/15]
= 45*{[(293+7)-(68+7)]/15}
=45*[(300-60-15)/15]
=45*(300/15-60/15-15/15)
=45*(20-4-1)
=(40+5)*(10+5)
=400+200+50+25
=675
(185-85/5)*17
=[185-(40+40+5)/5]*17
=[185-(40/5+40/5+5/5)]*17
=[185-(8+8+1)]*17
=(100+88-20)*17
=(100+60+8)*(10+7)
=1000+600+80+700+420+56
=1000+(600+700)+(420+80)+56
=1000+1300+500+56
=2300+556
=2856
热心网友
好像不能简算
720/[(61-49)*5]=12
45*[(293-68)/15]=675
(185-85/5)*17=2856
热心网友
720/[(61-49)*5]= 720/(12*5)=720/60=12
45*[(293-68)/15]= 45*225/15=675
(185-85/5)*17= 185*17-85/5*17=3145+2=3434
热心网友
720/[(61-49)*5]=720/(12*5)=720/12/5=60/5=12
45*[(293-68)/15]=45*(225/15)=45*225/15=45/15*225=3*225=675
(185-85/5)*17=(100-1/5)*17=100*17-0.2*17=1700-3.4=1696.6
热心网友
1.原式=720/（61*5-49*5）
=720/60
=12
2.原式=（293-68）*3
=675
3.原式=185*17-85/5*17
=3145+2
=3434
