1/(1/60+1/40)=?
1个回答
1/60 + 1/40 = 2/120 + 3/120 = 5/120 = 1/24
1 / (1/24) = 24
相关问题
〔1-(1/40+1/60)×15〕÷1/40的简算?
(1+40%)X+(60-X)(1+64%)=90
简算!注意是简算!〔1-(1/40+1/60)×15〕÷1/40
1/60+1/40=1/x ,x等于多少?
(1)40+50+60+70+80=60×______.
﹙60+40﹚[﹙1/3﹚x+80]/60=x
选择,1.比60千克多40%是多少千克?a.60×40%+60 b.60×40% c.60+40%
十字交叉法:60 40-30=10 40 30 60-40=20 即60%:30%=1:2
60%a(1-20%)+40%a(1+x %)=a
1/12+1/24+1/40+1/60+1/84+1/112+1/144+1/180