3)→ АВ(9-3;-2+4); → АВ(6;2);
4) √(3²+(-4)²)=√(9+16)=5;
5)1*4-3*(-2)=4+6=10;
6) 1*7*сos45°=7*√2/2=3.5√2
7) m/5=3/(-9)⇒m=5*3/(-9)=-5/3
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3)→ АВ(9-3;-2+4); → АВ(6;2);
4) √(3²+(-4)²)=√(9+16)=5;
5)1*4-3*(-2)=4+6=10;
6) 1*7*сos45°=7*√2/2=3.5√2
7) m/5=3/(-9)⇒m=5*3/(-9)=-5/3