Toán Lớp 6: 37 · 39 + 78 · 14 + 13 · 85 + 52 · 55 Tínhh nhanh ạ:3
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Toán Lớp 6: 37 · 39 + 78 · 14 + 13 · 85 + 52 · 55 Tínhh nhanh ạ:3
Comments ( 2 )
=37.39+39.2.14+13.85+52.55
=37.39+39.28+13.85+52.55
=39.(37+28)+13.85+52.55
=39.65+13.85+52.55
=39.65+13.5.17+52.55
=39.65+65.17+5.11.4.13
=39.65+65.17+65.44
=65.(39+17+44)
=65.100
=6500