Question

A×b=91
,a×c=260calculati a×( b+c)

Answer 1

a×b=91
a×c=260
a×b+a×c=91+260
a×(b+c)=351

Answer 2

$a \times b=91 \\ a \times c =260 \\ a \times (b+c)=a \times b+a \times c=91+260=351 \\ \boxed{a \times (b+c)=351}$