Question

[nguyen duy dieu thuy]

78.31+78.24+78.17+22.72

tính bằng cách thuận tiện

Answer 1

[l҉o҉n҉g҉ d҉z҉]

Ta có: 78.31+78.24+78.17+22.72

= 78.(31 + 24 + 17)  + 22.72

= 78 .72 + 22.72

= 72.(78 + 22)

= 72. 100

= 7200

Answer 2

[Mít]

= 78.(31+24+17)+22.72

= 78.72+22.72

= 72.(78+22)

= 72.100

= 7200