Question

Hãy tính : x =a.b vs

a € { 14 ; 22 } , b € {28; 16}

Answer 1

Có 4 trường hợp của x

\(a=14;b=28\Rightarrow x=a\cdot b=14\cdot28=392\)

\(a=14;b=16\Rightarrow x=a\cdot b=14\cdot16=224\)

\(a=22;b=28\Rightarrow x=a\cdot b=22\cdot28=616\)

\(a=22;b=16\Rightarrow x=a\cdot b=22\cdot16=352\)

Vậy \(x\in\left\{392;224;616;352\right\}\)

Answer 2

Ta có :

\(a\in\left\{14,22\right\}\)

\(b\in\left\{28,16\right\}\)

\(\Leftrightarrow x=a.b=14.28=392\)

\(\Leftrightarrow x=a.b=14.16=224\)

\(\Leftrightarrow x=a.b=22.28=616\)

\(\Leftrightarrow x=a.b=22.16=352\)