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

Toán Lớp 5: Bài 1 : c, 125 x ( 34 + 12 ) + 125 x 34 d, 341 x 80 + 341 x 29 + 659 x 109 e, 25 x 1212 – 12 x 2525

Toán Lớp 5: Bài 1 :
c, 125 x ( 34 + 12 ) + 125 x 34
d, 341 x 80 + 341 x 29 + 659 x 109
e, 25 x 1212 – 12 x 2525

Comments ( 2 )

  1. c) 125 xx ( 34 + 12) + 125 xx 34
    = 125 xx 46 + 125 xx 34
    = 125 xx ( 46 + 34)
    = 125 xx 80
    = 10 000
    d) 341 xx 80 + 341 xx 29 + 659 xx 109
    = 341 xx ( 80 + 29) + 659 xx 109
    = 341 xx 109 + 659 xx 109
    = ( 341 + 659) xx 109
    = 1000 xx 109
    = 109 000
    e) 25 xx 1212 – 12 xx 2525
    = 25 xx 12 xx 101 – 12 xx 2525
    = ( 25 xx 101) xx 12 – 12 xx 2525
    = 2525 xx 12 – 12 xx 2525
    = 0
    #caty09

  2. bài 1
    c) 125x(34+12)+125×34
    =125×46+125×34
    =5750+4250
    =10000
    d) 341×80+341×29+659×109
    =27280+9889+71831
    =37169+71831
    =109000
    e) 25×1212-12×2525
    =30300-30300
    =0
     

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