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

Toán Lớp 5: 42.257+43.158 205.(2021+95) 283+119+37+17+81 25.35.40 125.9.80 11+12+13+…+98+99

Toán Lớp 5: 42.257+43.158
205.(2021+95)
283+119+37+17+81
25.35.40
125.9.80
11+12+13+…+98+99

Comments ( 2 )

  1. 42×257+ 43×158= 10794 + 43x 158 =10794 + 6794=17588
    205 x ( 2021 +95)= 205 x 2116=433 780
    25 x 35 x40 =875 x 40 =35 000
    125 x 9 x80 =125 x80 x9 =10 000×9 =90 000
    11+12+13+…+98+99
    ta có số cặp là  (99-1) : 2= 49 (cặp )và thừa số 1 số là  50
    vì 11 + 99 = 101 ;12+ 98 = 101; 13 + 97= 101
    nên 11+12+13+…+98+99 = 101 x49 + 50=4999
               Đ/S : 4999
    vote cho mình 5 sao nha thanks
     

  2. 42.257+43.158=10794+6794=17588.
    205.(2021+95)=205.2116=433780.
    283+119+37+17+81=(283+17)+(119+81)+37
                                     =300+200+37=537
    25.35.40=(25.40).35=1000.35=35000.
    125.9.80=(125.80).9=10000.9=90 000.
    11+12+13+…+98+99=$\frac{(99+11).88}{2}$ =$\frac{110.88}{2}$ =4840

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