%@P:exocorcp %@Dif:2 Soient les nombres $a$, $b$, $c$ tels que $a=1\,250$; $b=813,27$ et $c=272,5$. \par Calcule $b+c$; $ac$ ; $a\times b$; $b\times c$. %@Correction: \opadd{813.27}{272.5}\kern2cm\opsub{1250}{272.5}\kern2cm\opmul{1250}{813.27}\kern2cm\opmul{813.27}{272.5}