(1)999*1999、(2)(1/15+2/17)*15*17,(3)20000/12.5/25/0.8/4 (4)3
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(1)999*1999、(2)(1/15+2/17)*15*17,(3)20000/12.5/25/0.8/4 (4)38*1/4+17*0.25+45*25%
![(1)999*1999、(2)(1/15+2/17)*15*17,(3)20000/12.5/25/0.8/4 (4)3](/uploads/image/z/354708-36-8.jpg?t=%EF%BC%881%EF%BC%89999%2A1999%E3%80%81%EF%BC%882%EF%BC%89%EF%BC%881%2F15%2B2%2F17%EF%BC%89%2A15%2A17%2C%EF%BC%883%EF%BC%8920000%2F12.5%2F25%2F0.8%2F4+%EF%BC%884%EF%BC%893)
(1).999*1999
=(1000-1)*1999
=1999000-1999
=1997001
(2) (1/15+2/17)*15*17
=17+2*15
=47
(3) 20000/12.5/25/0.8/4
=20000/(12.5*0.8*25*4)
=20000/(10*100)
=20000/1000
=20
(4) 38*1/4+17*0.25+45*25%
=38*1/4+17*1/4+45*1/4
=(38+17+45)*1/4
=100*1/4
=25
=(1000-1)*1999
=1999000-1999
=1997001
(2) (1/15+2/17)*15*17
=17+2*15
=47
(3) 20000/12.5/25/0.8/4
=20000/(12.5*0.8*25*4)
=20000/(10*100)
=20000/1000
=20
(4) 38*1/4+17*0.25+45*25%
=38*1/4+17*1/4+45*1/4
=(38+17+45)*1/4
=100*1/4
=25
(1)999*1999、(2)(1/15+2/17)*15*17,(3)20000/12.5/25/0.8/4 (4)3
这两道题怎么简算?(1)999×1999(2)20000÷12.5÷25÷0.8÷4
【1-(1/2-1/4)】*2/3=?列算式!20000÷12.5÷25÷0.8÷4=?列算式!38*1/4+17*0.
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1999+999*999 (1+3+5+…+99)-(2+4+6+ …+98)?
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(1)2×(-3)3-4×(-3)+15;
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1,2,3,7,8,17,15,()