Toán Tính nhanh

T

tanngoclai

7,2 : 2 x 57,2 + 2,86 x 2 x 64
= 7,2 : 2 x 10 x 5,72 + 2,86 x 2 x 64
= 3,6 x 10 x 5,72 + 5,72 x 64
= 36 x 5,72 + 5,72 x 64
= 5,72 x ( 36 + 64 )
= 5,72 x 100 = 572
cảm ơn đàng hoàng đó nghe
 
T

tanngoclai

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