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help pls al 3 lea randdddd​

Help Pls Al 3 Lea Randdddd class=

Răspuns :

Răspuns:

248×21 - 143×13 + 63×21 =

21(248+63) - 143×13 =

21×311 - 143×13 =

6531 - 1859 =

4672