Toán Lớp 4: 72×2+72×3+72×5
56×4+56×3+56×2+56
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Toán Lớp 4: 72×2+72×3+72×5
56×4+56×3+56×2+56
Comments ( 2 )
= 72 x (2 + 3 + 5)
= 72 x 10
= 720
56 x 4 + 56 x 3 + 56 x 2 + 56
= 56 x 4 + 56 x 3 + 56 x 2 + 56 x 1 (vì 56 x 1 = 56)
= 56 x (4 + 3 + 2 + 1)
= 56 x 10
= 560
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