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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 5: tính nhanh : 20122012 x 2011 – 20112011 x 2012 tìm x : ( X x 0,25 + 2011 ) x 2012 = ( 2011 + 53 ) + 2012

Toán Lớp 5: tính nhanh : 20122012 x 2011 – 20112011 x 2012
tìm x : ( X x 0,25 + 2011 ) x 2012 = ( 2011 + 53 ) + 2012

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    20122012 x 2011 – 20112011 x 2012 = (20112011+10001)x2011-20112011 x 2012 = 
    20112011×2011+10001×2011-20112011×2011+20112011 =2011x(20112011+10001-20112011)+20112011=2011×10001+20112011=20112011+20112011=40224022  
    ( X x 0,25 + 2011 ) x 2012 = ( 2011 + 53 ) + 2012=2064+2012=4076
    ⇒Xx0,25+2011=4076:2012=1019/503
    Xx0,25=1019/503-2011=-2008,974155
    ⇒X=-2008,974155:0,25=-8035,89662

  2. 20122012 x 2011 – 20112011 x 2012
    =2012×10001×2011-2011×10001×2012
    =0
    ( X x 0,25 + 2011 ) x 2012 = ( 2011 + 53 ) + 2012
    0,25×x+2011=(2011+53)+2012÷2012
    0,25×x+2011=2011+53
    0,25×x=2011+53-2011
    0,25×x=53
    x=212

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222-9+11+12:2*14+14 = ? ( )